JAVASCRIPT

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

refrence :
https://stackoverflow.com/questions/44004451/navigator-operation-requested-with-a-context-that-does-not-include-a-navigator

navigator operation requested with a context that does not include a navigator

final _navKey = GlobalKey<NavigatorState>();

void _navigateToLogin() {
  _navKey.currentState.popUntil((r) => r.isFirst);
  _navKey.currentState.pushReplacementNamed(LoginRoute.name);
}

@override
Widget build(BuildContext context) {
  return MaterialApp(
    navigatorKey: _navKey,
    ...
  );
}