Navigator operation requested with a context that does not include a Navigator.

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Center(
        child: RaisedButton(
          child: Text("About"),
          onPressed: () {
            Navigator.push(context, MaterialPageRoute(builder: (context){
              return About();
            }));
          },
        ),
      ),
    );
  }
}

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Builder(
        builder: (context) => Center(
              child: RaisedButton(
                child: Text("About"),
                onPressed: () {

Navigator.push(context, MaterialPageRoute(builder: (context){
  return About();
}));

},
              ),
            ),
      ),
    );
  }
}

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