enter image description here

I would appreciate it if you could tell me how to correct the error.

CodePudding user response：

StatefulWidget is malformed. The build method must be implemented in State.

class MyHomePage extends StatefulWidget {
  final String title;

  MyHomePage({required this.title});
  
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    ///your Code
  }
}

CodePudding user response：

The structure of your stateful widget looks wrong

class YellowBird extends StatefulWidget {
  const YellowBird({ Key? key }) : super(key: key);

  @override
  State<YellowBird> createState() => _YellowBirdState();
}

class _YellowBirdState extends State<YellowBird> {
  @override
  Widget build(BuildContext context) {
    return Container(color: const Color(0xFFFFE306));
  }
}