Having trouble running flutter_form_builder example 3.5.5

[uneewk]

Hello,

I picked up the example from the plugin page and tried to run it. It compiles fine but apk will not install on a Pixel 3a XL API 29 Emulator. I get the following error:

I/flutter (21854): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (21854): The following assertion was thrown building TextField(controller:
I/flutter (21854): TextEditingController#c28c4(TextEditingValue(text: ┤2019-10-24├, selection:
I/flutter (21854): TextSelection(baseOffset: -1, extentOffset: -1, affinity: TextAffinity.downstream, isDirectional:
I/flutter (21854): false), composing: TextRange(start: -1, end: -1))), focusNode: FocusNode#305dd, decoration:
I/flutter (21854): InputDecoration(labelText: "Appointment Time", suffixIcon: IconButton(Icon, padding:
I/flutter (21854): EdgeInsets.all(8.0)), alignLabelWithHint: false), dirty, state: _TextFieldState#c8ec5):
I/flutter (21854): No Material widget found.
I/flutter (21854): TextField widgets require a Material widget ancestor.
I/flutter (21854): In material design, most widgets are conceptually "printed" on a sheet of material. In Flutter's
I/flutter (21854): material library, that material is represented by the Material widget. It is the Material widget
I/flutter (21854): that renders ink splashes, for instance. Because of this, many material library widgets require that
I/flutter (21854): there be a Material widget in the tree above them.
I/flutter (21854): To introduce a Material widget, you can either directly include one, or use a widget that contains
I/flutter (21854): Material itself, such as a Card, Dialog, Drawer, or Scaffold.
I/flutter (21854): The specific widget that could not find a Material ancestor was:
I/flutter (21854): TextField(controller: TextEditingController#c28c4(TextEditingValue(text: ┤2019-10-24├, selection:
I/flutter (21854): TextSelection(baseOffset: -1, extentOffset: -1, affinity: TextAffinity.downstream, isDirectional:
I/flutter (21854): false), composing: TextRange(start: -1, end: -1))), focusNode: FocusNode#305dd, decoration:
I/flutter (21854): InputDecoration(labelText: "Appointment Time", suffixIcon: IconButton(Icon, padding:
I/flutter (21854): EdgeInsets.all(8.0)), alignLabelWithHint: false))
I/flutter (21854): The ancestors of this widget were:
I/flutter (21854): DateTimeField-[LabeledGlobalKey<FormFieldState>#35af9]
I/flutter (21854): FormBuilderDateTimePicker
I/flutter (21854): Column(direction: vertical, mainAxisAlignment: start, crossAxisAlignment: center)
I/flutter (21854): _FormScope
I/flutter (21854): WillPopScope
I/flutter (21854): Form-[LabeledGlobalKey#aa314]
I/flutter (21854): FormBuilder-[LabeledGlobalKey#a2363]
I/flutter (21854): Column(direction: vertical, mainAxisAlignment: start, crossAxisAlignment: center)
I/flutter (21854): MyApp
I/flutter (21854): [root]
I/flutter (21854):
I/flutter (21854): Widget creation tracking is currently disabled. Enabling it enables improved error messages. It can
I/flutter (21854): be enabled by passing --track-widget-creation to flutter run or flutter test.
I/flutter (21854):
I/flutter (21854): When the exception was thrown, this was the stack:
I/flutter (21854): #0 debugCheckHasMaterial. (package:flutter/src/material/debug.dart:65:7)
I/flutter (21854): #1 debugCheckHasMaterial (package:flutter/src/material/debug.dart:68:4)
I/flutter (21854): #2 _TextFieldState.build (package:flutter/src/material/text_field.dart:924:12)
I/flutter (21854): #3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4047:27)
I/flutter (21854): #4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3941:15)
I/flutter (21854): #5 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #6 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #7 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #8 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #9 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #13 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #14 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #15 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #16 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #17 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #18 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #19 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #20 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #21 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #22 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #24 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5233:32)
I/flutter (21854): #25 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #26 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #28 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #29 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #30 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #31 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #32 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #34 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #35 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #36 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #37 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #38 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #39 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #41 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #42 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #43 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #44 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #45 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #46 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #47 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #48 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #49 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #50 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
I/flutter (21854): #51 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #52 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #53 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5233:32)
I/flutter (21854): #54 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #55 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #56 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
I/flutter (21854): #57 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
I/flutter (21854): #58 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
I/flutter (21854): #59 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
I/flutter (21854): #60 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
I/flutter (21854): #61 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
I/flutter (21854): #62 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:998:16)
I/flutter (21854): #63 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:969:5)
I/flutter (21854): #64 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart:915:17)
I/flutter (21854): #65 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2328:19)
I/flutter (21854): #66 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:914:13)
I/flutter (21854): #67 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:795:7)
I/flutter (21854): #68 runApp (package:flutter/src/widgets/binding.dart:845:7)
I/flutter (21854): #69 main (package:flutter_forms/main.dart:5:16)
I/flutter (21854): #70 _runMainZoned.. (dart:ui/hooks.dart:229:25)
I/flutter (21854): #75 _runMainZoned. (dart:ui/hooks.dart:221:5)
I/flutter (21854): #76 _startIsolate. (dart:isolate-patch/isolate_patch.dart:305:19)
I/flutter (21854): #77 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
I/flutter (21854): (elided 4 frames from package dart:async)
I/flutter (21854):
I/flutter (21854): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (21854): Another exception was thrown: 'package:flutter/src/material/input_decorator.dart': Failed assertion: line 1611 pos 15: 'textDirection != null': is not true.
I/chatty (21854): uid=10135(com.example.flutter_forms) 1.ui identical 1 line
I/flutter (21854): Another exception was thrown: 'package:flutter/src/material/input_decorator.dart': Failed assertion: line 1611 pos 15: 'textDirection != null': is not true.
I/flutter (21854): Another exception was thrown: No Material widget found.
I/flutter (21854): Another exception was thrown: 'package:flutter/src/material/input_decorator.dart': Failed assertion: line 1611 pos 15: 'textDirection != null': is not true.
I/chatty (21854): uid=10135(com.example.flutter_forms) 1.ui identical 4 lines
I/flutter (21854): Another exception was thrown: 'package:flutter/src/material/input_decorator.dart': Failed assertion: line 1611 pos 15: 'textDirection != null': is not true.
I/flutter (21854): Another exception was thrown: No Directionality widget found.
I/flutter (21854): Another exception was thrown: No Directionality widget found.
I/flutter (21854): Another exception was thrown: Horizontal RenderFlex with multiple children has a null textDirection, so the layout order is undefined.
I/flutter (21854): Another exception was thrown: RenderBox was not laid out: RenderFlex#799cf relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (21854): Another exception was thrown: NoSuchMethodError: The method '>' was called on null.
D/EGL_emulation(21854): eglMakeCurrent: 0xec97f160: ver 2 0 (tinfo 0xe170f0f0)
D/eglCodecCommon(21854): setVertexArrayObject: set vao to 0 (0) 1 0
E/flutter (21854): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Cannot hit test a render box with no size.
E/flutter (21854): The hitTest() method was called on this RenderBox: RenderFlex#0153d:
E/flutter (21854): creator: Column ← MyApp ← [root]
E/flutter (21854): parentData:
E/flutter (21854): constraints: BoxConstraints(w=432.0, h=816.0)
E/flutter (21854): size: MISSING
E/flutter (21854): direction: vertical
E/flutter (21854): mainAxisAlignment: start
E/flutter (21854): mainAxisSize: max
E/flutter (21854): crossAxisAlignment: center
E/flutter (21854): verticalDirection: down
E/flutter (21854): Although this node is not marked as needing layout, its size is not set.
E/flutter (21854): A RenderBox object must have an explicit size before it can be hit-tested. Make sure that the RenderBox in question sets its size during layout.
E/flutter (21854): #0 RenderBox.hitTest. (package:flutter/src/rendering/box.dart:2111:9)
E/flutter (21854): #1 RenderBox.hitTest (package:flutter/src/rendering/box.dart:2126:6)
E/flutter (21854): #2 RenderView.hitTest (package:flutter/src/rendering/view.dart:172:13)
E/flutter (21854): #3 RendererBinding.hitTest (package:flutter/src/rendering/binding.dart:364:16)
E/flutter (21854): #4 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:128:7)
E/flutter (21854): #5 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (21854): #6 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (21854): #7 _rootRunUnary (dart:async/zone.dart:1136:13)
E/flutter (21854): #8 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (21854): #9 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (21854): #10 _invoke1 (dart:ui/hooks.dart:263:10)
E/flutter (21854): #11 _dispatchPointerDataPacket (dart:ui/hooks.dart:172:5)
E/flutter (21854):`

I am wondering if anyone has run into this issue before and how it was resolved if they have.
`

[danvick]

Hi @uneewk,
This can be fixed by wrapping your code with a Scaffold.

Kindly take note of these lines:

I/flutter (21854): No Material widget found.
I/flutter (21854): TextField widgets require a Material widget ancestor.

Refer here