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was my passing the data parameter wrong ? #41733

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Fa-d opened this issue Oct 1, 2019 · 5 comments
Closed

was my passing the data parameter wrong ? #41733

Fa-d opened this issue Oct 1, 2019 · 5 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';

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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Yes, you passed null as text to a Text widget.

If you look at the debug output

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'

a bit below there is a stack trace

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)

_AppState.build is the first in your own code and Flutter rells you even the line number where you tried to create the Textwidget: line 60

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

@Fa-d
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Fa-d commented Oct 2, 2019

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

Sorry .. I am new to flutter, & do not know what to submit :/ I did as the log said

@escamoteur
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No problem. As I explained to you above the error message is pretty clear. You only should submit an issue if the message does not explain what's wrong.

@github-actions
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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