Unable to load asset: /data/user/0/com.example.flutter_editor/cache/butterfly.png

[indjec]

this is my code:

Scaffold(
        appBar: AppBar(
          title: Text("Video player"),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            filePath != null
                ? Image(image: AssetImage(filePath))
                : Text('No Floatting Button Click')
          ],
        ),
        floatingActionButton: Row(
          mainAxisAlignment: MainAxisAlignment.end,
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            FloatingActionButton(
              tooltip: "Generate a file of thumbnail",
              onPressed: () async {
                final fileName = await VideoThumbnail.thumbnailFile(
                  video:
                      "https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4",
                  thumbnailPath: (await getTemporaryDirectory()).path,
                  imageFormat: ImageFormat.PNG,
                  maxHeight:
                      64, // specify the height of the thumbnail, let the width auto-scaled to keep the source aspect ratio
                  quality: 75,
                );
                setState(() {
                  final file = File(fileName);
                  filePath = file.path;
                });
              },
              child: Text('Click'),
            ),
          ],
        ));