The argument type '_MyHomePageState' can't be assigned to the parameter type 'TickerProvider'.

This error message is typically encountered when trying to pass a stateful widget as a TickerProvider to an animation controller.

To fix the error, you can either create a new class that extends TickerProvider or use the default TickerProvider that comes with the AnimationController class.

For example, if you have a MyHomePageState class that extends StatefulWidget, you can create a new class that extends TickerProvider like this:

class MyHomePageTickerProvider extends TickerProvider {
  @override
  Ticker createTicker(onTick) => Ticker(onTick);
}

Then, you can pass an instance of this new class to your animation controller like this:

AnimationController(
  vsync: MyHomePageTickerProvider(),
  duration: Duration(seconds: 1),
);

Alternatively, you can use the default TickerProvider that comes with the AnimationController class by passing `vsync: this` if your stateful widget extends TickerProviderStateMixin.

class MyHomePage extends StatefulWidget with TickerProviderStateMixin {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
          child: Text('Hello World'),
        ),
      ),
    );
  }

  @override
  void dispose() {
    super.dispose();
  }
}

Then, you can pass `vsync: this` to your animation controller like this:

AnimationController(
  vsync: this,
  duration: Duration(seconds: 1),
);