Exception caught by widgets library

[kahn1231]

flutter: VideoOutput.Resize
flutter: {handle: 5985293872, id: 0, rect: {height: 0.0, top: 0.0, left: 0.0, width: 0.0}}
flutter: NativeVideoController: Texture ID: 0
flutter: media_kit: wakelock: _count = 1
flutter: Could not open/initialize audio device -> no sound.
flutter: VideoOutput.Resize
flutter: {handle: 5985293872, id: 0, rect: {height: 1282.0, top: 0.0, width: 720.0, left: 0.0}}
Failed to change device orientation: Error Domain=UISceneErrorDomain Code=101 "None of the requested orientations are supported by the view controller. Requested: landscapeLeft, landscapeRight; Supported: portrait" UserInfo={NSLocalizedDescription=None of the requested orientations are supported by the view controller. Requested: landscapeLeft, landscapeRight; Supported: portrait}

======== Exception caught by widgets library =======================================================
The following _TypeError was thrown building LayoutBuilder:
type 'Null' is not a subtype of type 'String' in type cast

The relevant error-causing widget was:
MaterialApp MaterialApp:file:///Users/xiaofeng/AndroidStudioProjects/media_kit/lib/main.dart:42:12
When the exception was thrown, this was the stack:
#0 ListIterator.current (dart:_internal/iterable.dart:342:29)
#1 SubtitleViewState.build. (package:media_kit_video/src/subtitle/subtitle_view.dart)
#2 _LayoutBuilderElement._layout.layoutCallback (package:flutter/src/widgets/layout_builder.dart:139:77)
#3 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2844:19)
#4 _LayoutBuilderElement._layout (package:flutter/src/widgets/layout_builder.dart:173:12)
#5 RenderObject.invokeLayoutCallback. (package:flutter/src/rendering/object.dart:2686:59)
#6 PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:1097:15)
#7 RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:2686:14)
#8 RenderConstrainedLayoutBuilder.rebuildIfNecessary (package:flutter/src/widgets/layout_builder.dart:248:7)
#9 _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:331:5)
#10 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#11 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#12 RenderStack.layoutPositionedChild (package:flutter/src/rendering/stack.dart:516:11)
#13 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:622:30)
#14 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#15 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#16 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#17 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#18 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#19 RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:280:14)
#20 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#21 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#22 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#23 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#24 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#25 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#26 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1440:11)
#27 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#28 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#29 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#30 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#31 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#32 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#33 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#34 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#35 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#36 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#37 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#38 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#39 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#40 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#41 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#42 RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3728:13)
#43 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#44 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#45 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:21)
#46 RenderObject.layout (package:flutter/src/rendering/object.dart:2575:7)
#47 RenderBox.layout (package:flutter/src/rendering/box.dart:2389:11)
#48 _RenderTheaterMixin.layoutChild (package:flutter/src/widgets/overlay.dart:968:13)
#49 _RenderTheater.performLayout (package:flutter/src/widgets/overlay.dart:1282:9)
#50 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2414:7)
#51 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1051:18)
#52 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1064:15)
#53 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:582:23)
#54 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:991:13)
#55 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:448:5)
#56 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1386:15)
#57 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1311:9)
#58 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1169:5)
#59 _invoke (dart:ui/hooks.dart:312:13)
#60 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:399:5)
#61 _drawFrame (dart:ui/hooks.dart:283:31)

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when i perform full screen switching ,my app abnormal exit . i use ios simulator .