运行应用程序后，chewie库中出现错误

Question

我正在构建一个包含通过chewie库安装的视频的应用程序，但是当我运行该应用程序时，它收到的错误。未为_MaterialControlState类定义方法mouseregion。

> Container(
>               color: Colors.black,
>               height: MediaQuery.of(context).size.height*(30/100),
>               width: MediaQuery.of(context).size.width*(100/100),
>               child: videoFile==null?Center(
>                 child: Icon(Icons.videocam,color: Colors.red,size: 50.0,),
>               ):FittedBox(
>                 fit: BoxFit.contain,
>                 child: mounted?Chewie(
>                   controller: ChewieController(
>                     videoPlayerController: VideoPlayerController.file(videoFile),
>                     aspectRatio: 3/2,
>                     autoPlay: true,
>                     looping: true,
>                   ),
>                 ):Container(),
> 
>               )
>             ),

The following _CompileTimeError was thrown building MaterialControls(dirty, dependencies: [_ChewieControllerProvider], state: _MaterialControlsState#e4cc6):
'package:chewie/src/material_controls.dart': error: file:///C:/flutter/.pub-cache/hosted/pub.dartlang.org/chewie-0.9.8/lib/src/material_controls.dart:52:12: Error: The method 'MouseRegion' isn't defined for the class '_MaterialControlsState'.