ERROR:flutter/lib/ui/ui_dart_state.cc(209) Unhandled Exception: PlatformException - flutter

Question

I have my flutter App integrated with firebase, everything was fine but after i integrate firebase i got error whenever I try to run my app.
My main method looks like this:
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
runApp(child: MyApp());
}
Error:
E/flutter ( 7922): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception:
PlatformException(firebase_core, FirebaseApp name [DEFAULT] already exists!, null, null)
E/flutter ( 7922): #0 StandardMethodCodec.decodeEnvelope
(package:flutter/src/services/message_codecs.dart:607:7)
E/flutter ( 7922): #1 MethodChannel._invokeMethod
(package:flutter/src/services/platform_channel.dart:177:18)
E/flutter ( 7922): <asynchronous suspension>
E/flutter ( 7922): #2 MethodChannel.invokeMapMethod
(package:flutter/src/services/platform_channel.dart:377:43)
E/flutter ( 7922): <asynchronous suspension>
E/flutter ( 7922): #3 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:100:40)
E/flutter ( 7922): <asynchronous suspension>
E/flutter ( 7922): #4 Firebase.initializeApp
(package:firebase_core/src/firebase.dart:40:31)
E/flutter ( 7922): <asynchronous suspension>
E/flutter ( 7922): #5 main (package:zunada/main.dart:11:3)
E/flutter ( 7922): <asynchronous suspension>
E/flutter ( 7922):

Answer 1

I had similar issue when create firebase app by flavors using flutterfire CLI. I realized that flutterfire create apps with same name in different projects. Then I tried 2 ways and it works.
1st: manually change app name in each firebase project.
2nd: add param name when initialize such as in main_dev.dart
Example:
await Firebase.initializeApp(
name: "dev-project",
options: DefaultFirebaseOptions.currentPlatform);
I used the same name used in the firebase console as my project ID for consistency, keep in mind that you cannot add spaces to the name (only dashes -).