Flutter on iOS: redefinition of module 'Firebase'

Question

I've been trying to build my flutter app on iOS but flutter run is throwing the following error:

/Users/<MyUser>/Desktop/projects/app/ios/Pods/Firebase/CoreOnly/Source
s/module.modulemap:1:8: error: redefinition of module 'Firebase'
module Firebase {
       ^
/Users/<MyUser>/Library/Developer/Xcode/DerivedData/Runner-dbkgurnsasbvieahfnk
dontejqss/SourcePackages/checkouts/firebase-ios-sdk/CoreOnly/Sources/module.
modulemap:1:8: note: previously defined here
module Firebase {

I've imported the firebase-ios-sdk as per the instructions here. The imported modules are FirebaseCore, FirebaseAuth and FirebaseMessaging. I have not made any modifications to iOS-specific code (anything under /ios) apart from importing Firebase in the AppDelegate.swift file. The updated file now contains the following code:

import UIKit
import Flutter
import Firebase

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
  _ application: UIApplication,
  didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
 ) -> Bool {
   FirebaseApp.configure()
   GeneratedPluginRegistrant.register(with: self)
   return super.application(application, didFinishLaunchingWithOptions: launchOptions)
 }
}

After searching the error I've tried the following steps:

flutter clean
pod deintegrate and pod install
Cleaning DerivedData (both through XCode and manually)
Remove and re-add firebase-ios-sdk

But to no avail.

Wouter Pol · Accepted Answer · 2022-08-16T07:54:25.577

63

I've managed to resolve this issue by removing the firebase-ios-sdk dependency altogether. It appears that this is imported by the Flutter dependencies and adding it manually thus leads to a redefinition error.

I'd advise any people encountering this or similar errors to make sure that the integration steps they are following are meant for Flutter and not for iOS (only).

Guide to remove dependencies (as suggested by ΞΫΛL): removing dependencies

edited Aug 16 '22 at 07:54

answered Jan 20 '22 at 18:45

Wouter Pol

1,031
1
8
16

I don't even have this one lol – Christian Leon Feb 15 '22 at 02:01
16

Thanks! That solved it for me! For others that might be looking for this, that is in Xcode → Projects → Runner → Package dependencies – ΞΫΛL Feb 16 '22 at 23:42
@ΞΫΛL Hi! I can't seem to find package dependencies folder/file under my runner. Can you enlighten me on this matter? – ZXERSTON Mar 10 '22 at 12:23
9

Try this guide: ![removing dependencies](https://i.imgur.com/th57QAJ.png) – ΞΫΛL Mar 11 '22 at 18:12
1

Plz include the "removing dependencies" link in the answer! One shouldn't have to read comments to get what one needs, since according to StackOverflow docs, comments can be cleared away at any time. – Karolina Hagegård Aug 13 '22 at 21:03
1

May God bless your soul man. It worked!!!!!! Thank youuuuu!!! – Mad World Mar 19 '23 at 22:33

score 28 · Answer 2 · answered Mar 11 '22 at 10:40

As Wouter Pol suggested, this error will most likely happen if you followed to many configuration guides and did some iOS-specific (non-Flutter) setup for Firebase.

I had to undo two changes:

1 - remove added code from AppDelegate.swift

Here is how it should look like - no import Firebase and no FirebaseApp.configure()

2 - No package dependencies

I added the Firebase package before, but I don't need it when I already configured Flutter with appropriate packages. Here is how Runner > Swift Packages should look like:

score 3 · Answer 3 · answered Jan 20 '22 at 08:43

3

If you use M1 try this

arch -x86_64 pod install

answered Jan 20 '22 at 08:43

Taz

1,737
1
15
30

Unfortunately I'm not using a M1-cpu. I've tried it nonetheless but, as one might have expected, it did nothing to resolve the issue. – Wouter Pol Jan 20 '22 at 13:33

Flutter on iOS: redefinition of module 'Firebase'

3 Answers3

I had to undo two changes:

1 - remove added code from AppDelegate.swift

2 - No package dependencies

Linked

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