Login button is not getting activated when used in routes

[pravinarr]

I am creating a new app with navigation declared on the material app

class App extends StatelessWidget {
  Widget build(BuildContext context) {
    return  MaterialApp(
        title: 'Log Me In!',
        routes: {
          '/':(context) => Provider(
            child: Scaffold(
              body: LoginScreen(),
            ),
          )
        },
       );
  }
}

If I use the above code Login button is not getting activated. I tried debugging, but Stream get submitValid => Observable.combineLatest2(email, password, (e, p) => true); submitValid stream is always empty.

If I am not using the navigation and it works fine as expected.

I am new to flutter, I might be missing something here. So any help in finding the issue will help me a lot.

thanks in advance

[pravinarr]

The issue was due to multiple instance of Bloc being created when used with routes. To solve this issue, use final bloc or instantiate all the blocs in initState method