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was my passing the data parameter wrong ? #41732

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Fa-d opened this issue Oct 1, 2019 · 2 comments
Closed

was my passing the data parameter wrong ? #41732

Fa-d opened this issue Oct 1, 2019 · 2 comments

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@Fa-d
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Fa-d commented Oct 1, 2019 •
edited by escamoteur
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Launching lib\main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...
Running Gradle task 'assembleDebug'...
Built build\app\outputs\apk\debug\app-debug.apk.
Installing build\app\outputs\apk\app.apk...
I/esting_rotatio(12086): CollectorTransition concurrent copying GC freed 406(75KB) AllocSpace objects, 3(60KB) LOS objects, 58% free, 1104KB/2640KB, paused 55.490ms total 249.710ms
W/esting_rotatio(12086): Accessing hidden method Landroid/view/accessibility/AccessibilityNodeInfo;->getSourceNodeId()J (greylist, reflection, allowed)
W/esting_rotatio(12086): Accessing hidden method Landroid/view/accessibility/AccessibilityRecord;->getSourceNodeId()J (greylist, reflection, allowed)
W/esting_rotatio(12086): Accessing hidden field Landroid/view/accessibility/AccessibilityNodeInfo;->mChildNodeIds:Landroid/util/LongArray; (greylist, reflection, allowed)
W/esting_rotatio(12086): Accessing hidden method Landroid/util/LongArray;->get(I)J (greylist, reflection, allowed)
D/HostConnection(12086): HostConnection::get() New Host Connection established 0xe4569050, tid 12126
D/HostConnection(12086): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_2
W/OpenGLRenderer(12086): Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
D/eglCodecCommon(12086): setVertexArrayObject: set vao to 0 (0) 0 0
D/EGL_emulation(12086): eglCreateContext: 0xe451a120: maj 2 min 0 rcv 2
D/HostConnection(12086): HostConnection::get() New Host Connection established 0xe4569280, tid 12216
D/HostConnection(12086): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_2
D/eglCodecCommon(12086): setVertexArrayObject: set vao to 0 (0) 0 0
D/EGL_emulation(12086): eglCreateContext: 0xe451a420: maj 2 min 0 rcv 2
D/EGL_emulation(12086): eglMakeCurrent: 0xe451a120: ver 2 0 (tinfo 0xe450f460)
W/Gralloc3(12086): mapper 3.x is not supported
D/HostConnection(12086): createUnique: call
D/HostConnection(12086): createUnique: call
D/HostConnection(12086): HostConnection::get() New Host Connection established 0xe4569460, tid 12126
D/HostConnection(12086): HostConnection::get() New Host Connection established 0xca2778c0, tid 12216
D/HostConnection(12086): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_2
D/eglCodecCommon(12086): allocate: Ask for block of size 0x1000
D/eglCodecCommon(12086): allocate: ioctl allocate returned offset 0x3ffffa000 size 0x2000
D/HostConnection(12086): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_2
D/EGL_emulation(12086): eglMakeCurrent: 0xe451a420: ver 2 0 (tinfo 0xcd7ea8e0)
Syncing files to device Android SDK built for x86...
I/flutter (12086): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (12086): The following assertion was thrown building DragTarget(dirty, state:
I/flutter (12086): _DragTargetState#85cb9):
I/flutter (12086): A non-null String must be provided to a Text widget.
I/flutter (12086): 'package:flutter/src/widgets/text.dart':
I/flutter (12086): Failed assertion: line 269 pos 10: 'data != null'
I/flutter (12086):
I/flutter (12086): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (12086): more information in this error message to help you determine and fix the underlying cause.
I/flutter (12086): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (12086): https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (12086):
I/flutter (12086): User-created ancestor of the error-causing widget was:
I/flutter (12086): Positioned file:///C:/Users/ERROR/Desktop/Practice/testing_rotation/lib/main.dart:34:9
I/flutter (12086):
I/flutter (12086): When the exception was thrown, this was the stack:
I/flutter (12086): #2 new Text (package:flutter/src/widgets/text.dart:269:10)
I/flutter (12086): #3 _AppState.build. (package:testing_rotation/main.dart:60:28)
I/flutter (12086): #4 _DragTargetState.build (package:flutter/src/widgets/drag_target.dart)
I/flutter (12086): #5 StatefulElement.build (package:flutter/src/widgets/framework.dart:4047:27)
I/flutter (12086): #6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3941:15)
I/flutter (12086): #7 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #9 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #10 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #11 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #12 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #13 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #14 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #15 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #16 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #17 ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4314:11)
I/flutter (12086): #18 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #19 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5233:32)
I/flutter (12086): #20 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #22 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #23 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #24 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #25 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #26 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #27 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #28 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #29 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #30 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #31 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #32 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #33 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #34 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #35 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #36 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #37 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #38 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #39 ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4314:11)
I/flutter (12086): #40 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #41 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5233:32)
I/flutter (12086): #42 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #43 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #45 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #46 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #47 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #48 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #49 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #50 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #51 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #52 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #53 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #54 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #55 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #56 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #57 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #58 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #59 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #60 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #61 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #62 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #63 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #64 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #65 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #66 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #67 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #68 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #69 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #70 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #71 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #72 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #73 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #74 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #75 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #76 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #77 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #78 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #79 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #80 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #81 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #82 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #83 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #84 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #85 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #86 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #87 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #88 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #89 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #90 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #91 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #92 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #93 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #94 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #95 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #96 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #97 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #98 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #99 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #100 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #101 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #102 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #103 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #104 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #105 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #106 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #107 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #108 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #109 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #110 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #111 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #112 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #113 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #114 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #115 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #116 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #117 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #118 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #119 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #120 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #121 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #122 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #123 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #124 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #125 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #126 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #127 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #128 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #129 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #130 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #131 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #132 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #133 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #134 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #135 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #136 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #137 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
D/eglCodecCommon(12086): setVertexArrayObject: set vao to 0 (0) 1 0
D/EGL_emulation(12086): eglMakeCurrent: 0xe451a120: ver 2 0 (tinfo 0xe450f460)
D/eglCodecCommon(12086): setVertexArrayObject: set vao to 0 (0) 1 0
I/OpenGLRenderer(12086): Davey! duration=4274ms; Flags=1, IntendedVsync=14847155294824, Vsync=14847155294824, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=14847162867500, AnimationStart=14847162938200, PerformTraversalsStart=14847162995000, DrawStart=14851235194600, SyncQueued=14851236552200, SyncStart=14851241275600, IssueDrawCommandsStart=14851241975000, SwapBuffers=14851267858800, FrameCompleted=14851434108400, DequeueBufferDuration=40464000, QueueBufferDuration=1269000,
I/Choreographer(12086): Skipped 261 frames! The application may be doing too much work on its main thread.
I/esting_rotatio(12086): NativeAlloc concurrent copying GC freed 849(116KB) AllocSpace objects, 0(0B) LOS objects, 57% free, 1132KB/2668KB, paused 985us total 536.600ms
I/OpenGLRenderer(12086): Davey! duration=1080ms; Flags=0, IntendedVsync=14851591610686, Vsync=14851591610686, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=14851594374200, AnimationStart=14851594452600, PerformTraversalsStart=14851594527800, DrawStart=14851595078700, SyncQueued=14851595142300, SyncStart=14851643666700, IssueDrawCommandsStart=14851648355000, SwapBuffers=14851649101500, FrameCompleted=14852720690200, DequeueBufferDuration=88282000, QueueBufferDuration=5649000,
I/flutter (12086): #138 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #139 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #140 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #141 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #142 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #143 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #144 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #145 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #146 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #147 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #148 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #149 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #151 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #157 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #160 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #167 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #168 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #173 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #196 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #197 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5233:32)
I/flutter (12086): #198 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #214 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #215 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #216 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #217 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #218 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #224 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #225 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #226 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
I/flutter (12086): #227 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
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I/flutter (12086): #230 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #231 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #232 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
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I/flutter (12086): #236 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #237 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #238 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #239 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
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I/flutter (12086): #242 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #243 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #244 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #245 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #246 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #247 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #248 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #249 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #250 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #252 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #253 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #254 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #255 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #256 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #257 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
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I/flutter (12086): #259 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #260 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #261 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #262 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #263 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
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I/flutter (12086): #265 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #266 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #267 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #268 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #269 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #270 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
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I/flutter (12086): #272 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #273 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #274 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #276 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #277 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
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I/flutter (12086): #279 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #280 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #281 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #282 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #283 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #284 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
D/EGL_emulation(12086): eglMakeCurrent: 0xe451a420: ver 2 0 (tinfo 0xcd7ea8e0)
D/eglCodecCommon(12086): setVertexArrayObject: set vao to 0 (0) 7 0
I/flutter (12086): #285 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #286 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #287 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #288 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #289 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #290 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #291 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #292 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #293 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #294 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
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I/flutter (12086): #299 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
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I/flutter (12086): #366 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #367 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #368 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #369 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #370 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #371 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (12086): #372 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #373 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (12086): #374 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (12086): #375 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (12086): #376 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (12086): #377 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (12086): #378 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (12086): #379 Element.inflateWidget
`import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';

this is the code

void main() => runApp((MyApp()));

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: App(),
      ),
    );
  }
}

class App extends StatefulWidget {
  @override
  _AppState createState() => _AppState();
}

class _AppState extends State<App> {
  Color caughtColor = Colors.grey;
  String p;

  @override
  Widget build(BuildContext context) {
    var w = MediaQuery.of(context).size.width / 6;
    var h = MediaQuery.of(context).size.height / 8;
    return Stack(
      children: <Widget>[
//        DragBox(Offset(100.0, 0.0), Colors.orange, 'Box Two'),
        DragBox(Offset(200.0, 0.0), Colors.lime, 'Box One'),
        Positioned(
          left: 100.0,
          bottom: 0.0,
          child: DragTarget(
            onAccept: (data) {
              caughtColor = data[0];
              p = data[1];
            },
            builder: (
              BuildContext context,
              List<dynamic> accepted,
              List<dynamic> rejected,
            ) {
              return InkWell(
                onTap: () => Scaffold.of(context).showSnackBar(SnackBar(
                  content: Text("hello there"),
                  duration: Duration(milliseconds: 200),
                )),
                child: Container(
                  width: 200.0,
                  height: 200.0,
                  decoration: BoxDecoration(
                      color: accepted.isEmpty
                          ? caughtColor
                          : Colors.grey.shade200,),
                  child: Center(
                    child: Text(accepted.isEmpty ? p : "Drag here"),
                  ),
                ),
              );
            },
          ),
        )
      ],
    );
  }
}

class DragBox extends StatefulWidget {
  final Offset initPos;
  final String label;
  final Color itemColor;

  DragBox(this.initPos, this.itemColor, this.label);

  @override
  State<StatefulWidget> createState() => DragBoxState();
}

class DragBoxState extends State<DragBox> {
  Offset position = Offset(0.0, 0.0);

  @override
  void initState() {
    super.initState();
    position = widget.initPos;
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Positioned(
      left: position.dx,
      top: position.dy,
      child: Draggable(
        data: [widget.itemColor, widget.label],
        child: Container(
          width: 80.0,
          height: 80.0,
          color: widget.itemColor,
          child: Center(
            child: Text(
              widget.label,
              style: TextStyle(
                  color: Colors.white,
                  decoration: TextDecoration.none,
                  fontSize: 20.0),
            ),
          ),
        ),
        onDraggableCanceled: (velocity, offset) {
          setState(() {
            position = offset;
          });
        },
        feedback: Container(
          width: 120.0,
          height: 120.0,
          color: widget.itemColor.withOpacity(0.5),
          child: Text(
            widget.label,
            style: TextStyle(
                color: Colors.white,
                decoration: TextDecoration.none,
                fontSize: 18.0),
          ),
        ),
      ),
    );
  }
}
@escamoteur
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If you look at the stack trace you find:

Syncing files to device Android SDK built for x86...
I/flutter (12086): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (12086): The following assertion was thrown building DragTarget(dirty, state:
I/flutter (12086): _DragTargetState#85cb9):
I/flutter (12086): A non-null String must be provided to a Text widget.
I/flutter (12086): 'package:flutter/src/widgets/text.dart':
I/flutter (12086): Failed assertion: line 269 pos 10: 'data != null'

you passed null to a TextWidget

a bit below we fing:

I/flutter (12086): When the exception was thrown, this was the stack:
I/flutter (12086): #2 new Text (package:flutter/src/widgets/text.dart:269:10)
I/flutter (12086): #3 _AppState.build. (package:testing_rotation/main.dart:60:28)

_AppState is the first of your own widgets and Flutter tells you in which line the Text widget is that has the problem.

Please ask questions like this on stackoverflow because we are not able to give individual support here.

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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.

@github-actions github-actions bot locked as resolved and limited conversation to collaborators Aug 27, 2021
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@escamoteur @Fa-d