WANGNlMA commented 3 years ago

The following _CastError was thrown building FutureBuilder(dirty, state: _FutureBuilderState#5d67a): Null check operator used on a null value

The relevant error-causing widget was: FutureBuilder file:///D:/02B-flutter/flutter_to_uni/lib/main.dart:299:12

When the exception was thrown, this was the stack:

0 NavigationControls.build. (package:flutter_to_uni/main.dart:305:59)

1 _FutureBuilderState.build (package:flutter/src/widgets/async.dart:773:55)

2 StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27)

3 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15)

4 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)

5 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)

6 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4474:5)

7 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4658:11)

8 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4469:5)

... Normal element mounting (7 frames)

15 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)

16 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6094:32)

... Normal element mounting (19 frames)

35 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)

36 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6094:32)

... Normal element mounting (129 frames)

165 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)

166 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6094:32)

... Normal element mounting (238 frames)

404 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)

405 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6094:32)

... Normal element mounting (309 frames)

714 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3541:14)

715 Element.updateChild (package:flutter/src/widgets/framework.dart:3306:18)

716 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1182:16)

717 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:1153:5)

718 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart:1095:18)

719 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2647:19)

720 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:1094:13)

721 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:9

c1avie commented 3 years ago

视频view跟webview同一个页面展示了吗