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Help!! NoSuchMethodError: The method '>' was called on null #43980

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dragon9ex opened this issue Nov 1, 2019 · 2 comments
Closed

Help!! NoSuchMethodError: The method '>' was called on null #43980

dragon9ex opened this issue Nov 1, 2019 · 2 comments

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@dragon9ex
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I want to realise Schulte grid , This is my code:

import 'package:flutter/material.dart';

void main(){
runApp(MyApp());
}

class MyApp extends StatelessWidget{
const MyApp({Key key} ) : super(key: key);

Widget build(BuildContext context) {
return MaterialApp(
title: "Schulte grid",
home: SchulteCell(),
);
}
}

class SchulteCell extends StatefulWidget{
SchulteCell({Key key}) : super(key: key);

_SchulteCellState createState() => _SchulteCellState();
}

class _SchulteCellState extends Statewith TickerProviderStateMixin{
int count;
List data=List();
List curSel=List();
List controllers=List();
List<Animation> animations=List<Animation>();

void iniState() {
super.initState();
count=16;
List.generate(count, (index){
data.add(index+1);
controllers.add(AnimationController(
vsync:this, duration: Duration(milliseconds: 600)));
animations.add(
ColorTween(begin: Colors.white, end: Colors. purpleAccent)
.animate(controllers[index])..addListener((){
setState(() {

          });
    })
  );
});
data.shuffle();

}

tapCell(i){
int lastSel= curSel.length>0?curSel.last:0;
if(data[i]-1==lastSel) {
animations[i] = ColorTween(begin: Colors.white, end: Colors.purpleAccent)
.animate(controllers[i])
..addListener(() {
setState(() {

      });
    });
  curSel.add(data[i]);
}
else{
  animations[i] = ColorTween(begin: Colors.white, end: Colors.redAccent)
      .animate(controllers[i])
    ..addListener(() {
      setState(() {

      });
    });



}
controllers[i].forward(from: 0).then((_)=>controllers[i].reverse());

}

Widget build(BuildContext context){
return Scaffold(
appBar: AppBar(title: Text("Schulte grid"),),
body: GridView.count(
crossAxisCount: 4,
children:
List.generate(
count, (index) => Container(
alignment: Alignment.center,
decoration: BoxDecoration(border: Border.all(width: 1),
color: animations[index].value),
child: FlatButton(
onPressed: (){tapCell(index);},
child: Text(
"${data[index]}",
style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),

),

)
      ))),
);

}
}

AND THE IntelliJ demonstrates:

Performing hot restart...
Syncing files to device iPhone Xʀ...
Restarted application in 1,346ms.
flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following NoSuchMethodError was thrown building SchulteCell(dirty, state:
flutter: _SchulteCellState#4352f):
flutter: The method '>' was called on null.
flutter: Receiver: null
flutter: Tried calling: >(0)
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
flutter: #1 List.length= (dart:core-patch/growable_array.dart:119:22)
flutter: #2 new List.generate (dart:core/list.dart:158:23)
flutter: #3 _SchulteCellState.build (package:untitled/main.dart:86:16)
flutter: #4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4012:27)
flutter: #5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3924:15)
flutter: #6 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #7 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #8 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #10 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #11 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #12 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #13 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #14 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #15 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #16 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #17 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #18 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #19 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #20 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #21 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #22 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #23 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #24 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #25 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #26 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5198:32)
flutter: #27 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #28 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #29 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #30 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #31 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #32 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #33 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #34 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #35 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #36 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #37 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #38 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #39 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #40 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #41 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #42 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #43 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #44 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #45 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #46 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #47 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #48 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #49 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #50 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #51 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #52 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #53 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #54 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #55 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #56 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #57 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #58 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #59 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #60 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #61 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #62 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #63 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #64 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #65 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #66 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #67 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #68 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #69 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #70 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #71 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #72 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #73 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #74 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #75 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #76 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #77 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #78 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #79 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #80 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #81 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #82 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #83 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #84 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #85 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #86 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #87 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #88 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #89 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #90 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #91 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #92 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #93 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #94 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #95 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #96 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #97 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #98 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #99 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #100 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #101 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #102 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #103 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #104 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #105 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #106 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #107 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #108 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #109 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #110 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #111 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #112 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #113 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #114 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #115 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #116 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #117 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #118 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #119 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #120 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #121 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #122 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #123 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #124 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #125 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #126 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5198:32)
flutter: #127 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #128 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #129 _TheatreElement.mount (package:flutter/src/widgets/overlay.dart:593:16)
flutter: #130 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #131 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #132 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #133 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #134 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #135 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #136 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #137 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #138 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #139 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #140 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #141 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #142 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #143 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #144 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #145 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #146 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #147 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #148 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #149 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #150 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #151 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #152 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #153 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #154 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #155 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #156 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #157 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #158 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #159 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #160 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #161 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #162 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #163 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #164 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #165 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #166 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #167 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #168 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #169 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #170 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #171 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #172 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #173 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #174 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #175 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #176 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #177 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #178 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #179 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #180 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #181 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #182 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #183 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #184 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #185 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #186 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #187 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #188 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #189 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #190 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #191 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #192 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #193 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #194 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #195 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #196 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #197 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #198 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #199 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #200 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #201 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #202 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #203 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #204 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #205 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #206 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #207 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #208 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #209 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #210 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #211 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #212 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #213 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #214 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #215 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #216 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #217 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #218 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #219 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #220 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #221 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #222 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #223 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #224 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #225 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #226 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #227 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #228 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #229 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #230 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #231 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #232 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #233 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #234 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #235 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #236 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #237 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #238 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #239 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #240 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #241 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #242 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #243 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #244 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #245 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #246 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #247 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #248 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #249 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #250 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #251 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #252 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #253 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #254 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #255 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #256 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
flutter: #257 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #258 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #259 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #260 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #261 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #262 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #263 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #264 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #265 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #266 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #267 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #268 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #269 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #270 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #271 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #272 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #273 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #274 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #275 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #276 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #277 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #278 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #279 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #280 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #281 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #282 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #283 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #284 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #285 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #286 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #287 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #288 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #289 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #290 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #291 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #292 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #293 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #294 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4053:11)
flutter: #295 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #296 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #297 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #298 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #299 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #300 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
flutter: #301 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
flutter: #302 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
flutter: #303 Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
flutter: #304 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:939:16)
flutter: #305 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:910:5)
flutter: #306 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart:856:17)
flutter: #307 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2320:19)
flutter: #308 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:855:13)
flutter: #309 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:736:7)
flutter: #310 runApp (package:flutter/src/widgets/binding.dart:786:7)
flutter: #311 main (package:untitled/main.dart:5:3)
flutter: #312 _runMainZoned.. (dart:ui/hooks.dart:216:25)
flutter: #317 _runMainZoned. (dart:ui/hooks.dart:208:5)
flutter: #318 _startIsolate. (dart:isolate-patch/isolate_patch.dart:301:19)
flutter: #319 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
flutter: (elided 4 frames from package dart:async)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following NoSuchMethodError was thrown building SchulteCell(dirty, state:
flutter: _SchulteCellState#4352f):
flutter: The method '>' was called on null.
flutter: Receiver: null
flutter: Tried calling: >(0)
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
flutter: #1 List.length= (dart:core-patch/growable_array.dart:119:22)
flutter: #2 new List.generate (dart:core/list.dart:158:23)
flutter: #3 _SchulteCellState.build (package:untitled/main.dart:86:16)
flutter: #4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4012:27)
flutter: #5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3924:15)
flutter: #6 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #7 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #8 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #9 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #13 StatelessElement.update (package:flutter/src/widgets/framework.dart:3981:5)
flutter: #14 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #15 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #16 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #17 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #19 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:4817:32)
flutter: #20 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5208:17)
flutter: #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #22 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #23 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #24 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #25 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #26 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #27 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #28 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #29 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #30 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #31 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #32 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #33 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #35 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #36 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #37 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #38 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #39 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #41 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #42 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #43 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #45 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #46 StatelessElement.update (package:flutter/src/widgets/framework.dart:3981:5)
flutter: #47 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #48 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #49 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #50 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #51 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #52 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #53 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #54 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #55 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #56 ProxyElement.update (package:flutter/src/widgets/framework.dart:4219:5)
flutter: #57 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:94:11)
flutter: #58 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #59 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #60 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #61 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #62 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #63 StatefulElement.update (package:flutter/src/widgets/framework.dart:4085:5)
flutter: #64 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #65 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #66 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #67 StatelessElement.update (package:flutter/src/widgets/framework.dart:3981:5)
flutter: #68 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #69 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5099:14)
flutter: #70 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #71 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #72 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #73 ProxyElement.update (package:flutter/src/widgets/framework.dart:4219:5)
flutter: #74 Element.updateChild (package:flutter/src/widgets/framework.dart:2876:15)
flutter: #75 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
flutter: #76 Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
flutter: #77 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2340:33)
flutter: #78 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:700:20)
flutter: #79 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
flutter: #80 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
flutter: #81 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
flutter: #82 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:784:7)
flutter: #84 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
flutter: #85 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
flutter: #86 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
flutter: (elided one frame from package dart:async-patch)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════
@iapicca
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iapicca commented Nov 1, 2019

Hi @dragon9ex
This platform is not met for assistance on personal code.
Please see https://flutter.dev/community for resources for asking questions like this,
you may also get some help if you post it on Stack Overflow.
Closing, as this isn't an issue with Flutter itself,
if you disagree please write in the comments and I will reopen it
Thank you

@iapicca iapicca closed this as completed Nov 1, 2019
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This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

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