Youtube_player_flutter: deactivate() 方法给出错误

当我将包含视频播放器的页面导航到另一个页面时，它会在 _controller.pause(); 线。

无效停用（）{
_controller.pause();
super.deactivate();
}

事件日志如下：

W/ScreenOrientationListener(17293)：移除一个不存在的观察者！
W/铬（17293）：[警告：aw_contents.cc（315）] SP>>>销毁
I/chromium(17293): [INFO:synchronous_compositor_impl.cc(111)] [SynchronousCompositorImpl::SetClient] [0x0000007f359b5ec0]
I/MediaCodec(17293): [release]line:383 [OMX.google.opus.decoder]+++
I/ACodec (17293)：freeBuffersOnPort 端口索引 0
I/ACodec (17293)：freeBuffersOnPort 端口索引 1
I/MediaCodec(17293): [onMessageReceived]line:1268 [OMX.google.opus.decoder][what=kWhatShutdownCompleted][state 10][msg='AMessage(what = 'codec', target = 2) = {
I/MediaCodec(17293): int32_t what = 1935896429
我/媒体编解码器（17293）：}']
I/MediaCodec(17293): [~MediaCodec]line:205 [][mState 0]+++
I/MediaCodec(17293): [release]line:383 [OMX.MTK.VIDEO.DECODER.VP9]+++
I/ACodec (17293)：freeBuffersOnPort 端口索引 0
I/ACodec (17293)：freeBuffersOnPort 端口索引 1
I/MediaCodec(17293): [onMessageReceived]line:1268 [OMX.MTK.VIDEO.DECODER.VP9][what=kWhatShutdownCompleted][state 10][msg='AMessage(what = 'codec', target = 5) = {
I/MediaCodec(17293): int32_t what = 1935896429
我/媒体编解码器（17293）：}']
I/MediaCodec(17293): [~MediaCodec]line:205 [][mState 0]+++
E/flutter（17293）：[错误：flutter/lib/ui/ui_dart_state.cc（148）]未处理的异常：MissingPluginException（未找到通道plugins.flutter.io/webview_0上的方法evaluateJavascript的实现）
E/flutter (17293): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
E/颤振（17293）：
E/flutter (17293): #1 MethodChannelWebViewPlatform.evaluateJavascript (package:webview_flutter/src/webview_method_channel.dart:90:21)
E/flutter (17293): #2 WebViewController.evaluateJavascript (package:webview_flutter/webview_flutter.dart:626:39)
E/flutter (17293): #3 YoutubePlayerController._callMethod (package:youtube_player_flutter/src/utils/youtube_player_controller.dart:180:32)
E/flutter (17293)：#4 YoutubePlayerController.pause（包：youtube_player_flutter/src/utils/youtube_player_controller.dart:194:19）
E/flutter (17293): #5 _VideosScreenState.deactivate (package:youvilist/videosScreen.dart:133:34)
E/flutter (17293): #6 StatefulElement.deactivate (package:flutter/src/widgets/framework.dart:4135:12)
E/flutter (17293): #7 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1756:13)
E/flutter (17293): #8 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #9 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #10 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #11 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #12 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #13 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #14 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #15 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #16 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #17 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #18 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #19 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #20 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #21 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #22 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #23 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #24 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #25 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #26 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #27 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #28 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #29 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #30 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #31 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #32 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #33 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #34 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3990:14)
E/flutter (17293): #35 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/flutter (17293): #36 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5115:14)
E/flutter (17293): #37 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1758:13)
E/颤振（17293）：#38
W/铬（17293）：[警告：aw_network_delegate.cc（86）] https://r1---sn-nx5cvox-5uie.googlevideo.com/videoplayback?expire=1574443433&ei=ScXXXdWBL-TyxgKpl6m4Cw&ip=193.140.87.3&id=邻AF9ENbMJOc9OV4_Vekvta7EBAEi0vBUovMb0P1U1ZsBL＆ITAG = 248＆aitags = 133％2C134％2C135％2C136％2C137％2C160％2C242％2C243％2C244％2C247％2C248％2C278＆源= YouTube和requiressl = YES＆毫米= 31％2C29＆MN = SN-nx5cvox-5uie％2Csn-nv47lnsy＆MS = AU％ 2Crdu＆MV = M＆MVI = 0＆PL = 22＆initcwndbps = 652500＆MIME =视频％2Fwebm＆GIR = YES＆CLEN = 167339651＆DUR = 1537.920＆LMT = 1570277496757063＆MT = 1574421761＆fvip = 1＆存活=是＆FEXP = 23842630＆amp; C = WEB_EMBEDDED_PLAYER＆TXP = 5535432＆sparams =到期％2Cei％2Cip％2Cid％2Caitags％2Csource％2Crequiressl％2Cmime ％2Cgir％2Cclen％2Cdur％2Clmt＆SIG = ALgxI2wwRgIhAOsRGl_ihaPDxnSFt_2PeeuiQ9wAOw7qpXSrZLniIAn2AiEAgvZLPGOc2uPcqQtKuCuknRk6spcWaQ1Ops0Ff7ucV-Y％3D＆lsparams =毫米％2Cmn％2Cms％2Cmv％2Cmvi％2Cpl％2Cinitcwndbps＆LSIG = AHylml4wRQIgVci2Rv - Q2ngHQ_cosnpEL1lYD13oiqr71DdTHXOYMACIQDYW1uinNm8Mk6Esy8uLh2UObVCy7Eiw8HQGHgbhrtBNg％3D％3D＆ALR = YES＆CPN = PjP8wnSh2Ki85Zot＆cver = 20191 121&范围=4746501-6314657&rn=9&rbuf=27201#-3#1
E/chromium(17293)：[错误：deferred_gpu_command_service.cc(76)] 没有硬件渲染器。 可能出现死锁