my problem is :
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following _CastError was thrown building BlocBuilder<ScreenBloc, ScreenState>(dirty,
dependencies: [MediaQuery], state: _BlocBuilderBaseState<ScreenBloc, ScreenState>#d956c):
Null check operator used on a null value
The relevant error-causing widget was:
BlocBuilder<ScreenBloc, ScreenState>
BlocBuilder:file:///C:/Development/flutter/.pub-cache/hosted/pub.dartlang.org/iqplayer-0.4.1/lib/src/ui/screen_controllers.dart:23:12
When the exception was thrown, this was the stack:
#0 ScreenControllers.build.<anonymous closure> (package:iqplayer/src/ui/screen_controllers.dart:78:74)
#1 BlocBuilder.build (package:flutter_bloc/src/bloc_builder.dart:89:57)
#2 _BlocBuilderBaseState.build (package:flutter_bloc/src/bloc_builder.dart:165:21)
#3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4919:27)
#4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4806:15)
#5 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#6 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#7 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4787:5)
#8 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4968:11)
#9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4781:5)
... Normal element mounting (13 frames)
#22 _InheritedProviderScopeElement.mount (package:provider/src/inherited_provider.dart:411:11)
... Normal element mounting (7 frames)
#29 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#36 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#43 _NestedHookElement.mount (package:nested/nested.dart:187:11)
... Normal element mounting (7 frames)
#50 _InheritedProviderScopeElement.mount (package:provider/src/inherited_provider.dart:411:11)
... Normal element mounting (7 frames)
#57 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#64 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#71 _NestedHookElement.mount (package:nested/nested.dart:187:11)
... Normal element mounting (7 frames)
#78 _InheritedProviderScopeElement.mount (package:provider/src/inherited_provider.dart:411:11)
... Normal element mounting (7 frames)
#85 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#92 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#99 _NestedHookElement.mount (package:nested/nested.dart:187:11)
... Normal element mounting (7 frames)
#106 SingleChildWidgetElementMixin.mount (package:nested/nested.dart:222:11)
... Normal element mounting (7 frames)
#113 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3817:16)
#114 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6350:36)
#115 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6362:32)
... Normal element mounting (19 frames)
#134 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3817:16)
#135 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6350:36)
#136 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6362:32)
... Normal element mounting (367 frames)
#503 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3817:16)
#504 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6350:36)
#505 Element.updateChild (package:flutter/src/widgets/framework.dart:3551:18)
#506 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5883:32)
#507 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6375:17)
#508 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#509 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#510 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#511 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#512 StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#513 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#514 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#515 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#516 ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#517 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#518 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#519 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#520 ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#521 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:108:11)
#522 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#523 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6222:14)
#524 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#525 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#526 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#527 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#528 StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#529 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#530 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6222:14)
#531 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#532 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6222:14)
#533 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#534 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#535 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#536 ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#537 Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#538 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#539 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#540 Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#541 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
#542 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:891:21)
#543 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:370:5)
#544 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1146:15)
#545 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1083:9)
#546 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:997:5)
#550 _invoke (dart:ui/hooks.dart:151:10)
#551 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
#552 _drawFrame (dart:ui/hooks.dart:115:31)
(elided 3 frames from dart:async)
════════════════════════════════════════════════════════════════════════════════════════════════════
I/ExoPlayerImpl( 8745): Init e2ed845 [ExoPlayerLib/2.14.1] [star2lte, SM-G965F, samsung, 28]
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/chatty ( 8745): uid=10258(com.example.test_app) ExoPlayer:Loade identical 2 lines
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
E/flutter ( 8745): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Bad state: Future already completed
E/flutter ( 8745): #0 _AsyncCompleter.complete (dart:async/future_impl.dart:35:31)
E/flutter ( 8745): #1 VideoPlayerController.initialize (package:video_player/video_player.dart:310:25)
E/flutter ( 8745): <asynchronous suspension>
E/flutter ( 8745):
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
E/ExoPlayerImplInternal( 8745): Playback error
E/ExoPlayerImplInternal( 8745): UnknownHostException (no network)
E/flutter ( 8745): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: PlatformException(VideoError, Video player had error com.google.android.exoplayer2.ExoPlaybackException: Source error, null, null)
E/flutter ( 8745):
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out( 8745): (HTTPLog)-Static: isSBSettingEnabled false
E/ExoPlayerImplInternal( 8745): Playback error
i use iqplayer package
that`s my code :
import 'package:flutter/material.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
import 'package:iqplayer/iqplayer.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'IQPlayer Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'IQPlayer Demo'),
);
}
}
class MyHomePage extends StatelessWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Center(
child: Column(
children: [
ElevatedButton(
child: Text('Open IQPlayer'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) => IQScreen(
title: title,
description: 'Simple video as a demo video',
videoPlayerController: VideoPlayerController.network(
'https://d11b76aq44vj33.cloudfront.net/media/720/video/5def7824adbbc.mp4',
),
subtitleProvider: SubtitleProvider.fromString(
"""WEBVTT
00:00:00.650 --> 00:00:03.000
<p style="color:blue">Hello World</p>
00:00:03.024 --> 00:00:07.524
<i>Mindmarker je krátká zpráva formou
videa, souborů PDF...</i>
00:00:07.548 --> 00:0 simple_html_css: ^2.0.0+2
0:12.448
<span style='color:brown'>colorful</span>
00:00:12.472 --> 00:00:16.072
Mindmarker budeš obdržovat
ve specifický chvílích...
00:00:16.100 --> 00:00:20.100
abychom lépe utužili tvé znalosti.""",
),
// subtitleProvider: SubtitleProvider.fromNetwork(
// 'https://duoidi6ujfbv.cloudfront.net/media/0/subtitles/5675420c9d9a3.vtt'),
iqTheme: IQTheme(
loadingProgress: SpinKitCircle(
color: Colors.red,
),
playButtonColor: Colors.transparent,
videoPlayedColor: Colors.indigo,
playButton: (BuildContext context, bool isPlay,
AnimationController animationController) {
if (isPlay)
return Icon(
Icons.pause_circle_filled,
color: Colors.red,
size: 50,
);
return Icon(
Icons.play_circle_outline,
color: Colors.red,
size: 50,
);
},
),
),
),
);
},
),
],
),
),
);
}
}
idont know what is wrong, anyone can help? i really need help , the problem screen is (Null check operator used on a null value) that`s link of this package : https://pub.dev/packages/iqplayer.
Does anyone know what's wrong with the code? Although it is from the same add-on library on the Dart site