Flutter : Getting shared preferences crashes app

[TarikApp]

I want to use SharedPreferences in main class, but my application typically crashes(white page blocked) I added shared_preferences: ^0.5.7 to pubspec.yaml I have no error with flutter doctor

Thanks in Advance

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import 'package:flutter/material.dart'; import 'package:newsapp/screens/onboarding.dart'; import 'screens/home_screen.dart'; import 'package:shared_preferences/shared_preferences.dart';

void main() async{

SharedPreferences prefs = await SharedPreferences.getInstance(); bool seen=prefs.getBool('seen'); Widget _screen; _screen = OnBoarding(); runApp( NewsApp( _screen) );

}

class NewsApp extends StatelessWidget {

final Widget _screen; NewsApp(this._screen);

@override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, home: _screen, ); } }