flutter no firebase app ' default ' has been created - call firebase app.initializeapp() code example
Example: [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp() flutter
import 'package:firebase_core/firebase_core.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}