In IOS only, Firebase Core error: No implementation found for method Firebase#initializeCore on channel plugins.flutter.io/firebase_core

[YuvarajaCPR]

My case

1. I have native IOS and native Android project separately
2. Required to add flutter module in IOS project
3. Create button in IOS project and call flutter module.
4. I have situation to use cloud firebase in flutter module
5. so I adding required firebase plugin dependency in pubspec.yaml (eg. firebase_core, cloud_firebase)
6. Add 'await Firebase.initializeApp()' in my flutter main function.
7. When I run my application and It calling flutter main, then this issue arise 'No implementation found for method Firebase#initializeCore on channel plugins.flutter.io/firebase_core'

IOS Project calling function like
FlutterViewController* flutterViewController =
[[FlutterViewController alloc] initWithProject:nil
initialRoute:routeStr
nibName:nil
bundle:nil
];
flutterViewController.modalPresentationStyle = UIModalPresentationCustom;
[self presentViewController:flutterViewController animated:YES completion:nil];

Flutter Main function
Future main() async{
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyAppState());
}

So need a solution for my case, but In Android project it is working fine