How to fix VideoError (ExoPlaybackException: Source error) in Flutter video player?

I'm building a Flutter video player app and encountering the following error when trying to play videos:

[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: 
PlatformException(VideoError, Video player had error 
com.google.android.exoplayer2.ExoPlaybackException: 
Source error, null, null)

Code (Minimal Reproducible Example):

    class VideoInfo extends StatefulWidget {
      // ... other code ... 
    
    class _VideoInfoState extends State<VideoInfo> {
   
      late VideoPlayerController _controller;
     
      
      @override
      Widget build(BuildContext context) {
        return Scaffold(
            body: 
    // ... other code ... 

      Widget _playView(BuildContext context){
        final controller =_controller;
        if(controller!=null&&controller.value.isInitialized){
          return Container(
            height: 300,
            width: 300,
            child: VideoPlayer(controller),
          );
        }else{
          return Text("Being initialized pls wait");
        }
      }
      _onTapVideo(int index){
        final controller = VideoPlayerController.network(videoInfo[index]["videoUrl"]);
        _controller= controller;
        setState(() {
        });

What I've tried:

• Checked video URL validity.
• Ensured the video_player dependency is included.
• Added android.permission.INTERNET to the Android manifest.

You are assigning a value of the same variable.

Use,

_controller = controller;

instead of,

_controller=_controller;