Tutorial "Add a user authentication flow to a Flutter app using FirebaseUI" does not work on any platform

[lsman333]

Page URL

https://firebase.google.com/codelabs/firebase-auth-in-flutter-apps#3

Page source

No response

Describe the problem

Even running from the Complete directory and connecting the app to own Firebase project this example does not run.

Deploying to Android:
FirebaseException ([core/duplicate-app] A Firebase App named "[DEFAULT]" already exists)
Until this solution is applied:
https://stackoverflow.com/questions/70812697/a-firebase-app-named-default-already-exists
However, then the app does not run on other platforms.

Deploying to iOS:
Just deploys endlessly and the device shows a white screen.
Trying to build/run directly from Xcode gives various errors like "Framework 'Pods_Runner' not found" and "Linker command failed with exit code 1"

Deploying to web (Chrome):
This is the closest one to working. On first load, it displays the login screen (no logo), however no elements are clickable. After refreshing the screen, the elements can now be interacted with, however when trying to register a new account with email/password, simply "Error" is shown in subtitle. Same when trying to log in.
When trying to register or log in via "Sign in with Google", the Oauth window pops up briefly, but it is blank, then it immediately disappears, and "Error" is displayed in the subtitle.

Deploying to macOS:
Not possible due to errors below:
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:00008103-0032523523REG, name:My Mac }
{ platform:macOS, arch:x86_64, id:00008103-0032523523REG, name:My Mac }
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Flutter/GeneratedPluginRegistrant.swift:8:8: error: compiling for macOS 10.14, but module 'desktop_webview_auth' has a minimum deployment target of macOS 10.15: /Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/build/macos/Build/Products/Debug/desktop_webview_auth/desktop_webview_auth.framework/Modules/desktop_webview_auth.swiftmodule/arm64-apple-macos.swiftmodule
import desktop_webview_auth
^
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Flutter/GeneratedPluginRegistrant.swift:8:8: error: compiling for macOS 10.14, but module 'desktop_webview_auth' has a minimum deployment target of macOS 10.15: /Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/build/macos/Build/Products/Debug/desktop_webview_auth/desktop_webview_auth.framework/Modules/desktop_webview_auth.swiftmodule/arm64-apple-macos.swiftmodule
import desktop_webview_auth
^
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Flutter/GeneratedPluginRegistrant.swift:8:8: error: compiling for macOS 10.14, but module 'desktop_webview_auth' has a minimum deployment target of macOS 10.15: /Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/build/macos/Build/Products/Debug/desktop_webview_auth/desktop_webview_auth.framework/Modules/desktop_webview_auth.swiftmodule/arm64-apple-macos.swiftmodule
import desktop_webview_auth
^
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Flutter/GeneratedPluginRegistrant.swift:8:8: error: compiling for macOS 10.14, but module 'desktop_webview_auth' has a minimum deployment target of macOS 10.15: /Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/build/macos/Build/Products/Debug/desktop_webview_auth/desktop_webview_auth.framework/Modules/desktop_webview_auth.swiftmodule/arm64-apple-macos.swiftmodule
import desktop_webview_auth
^
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Flutter/GeneratedPluginRegistrant.swift:8:8: error: compiling for macOS 10.14, but module 'desktop_webview_auth' has a minimum deployment target of macOS 10.15: /Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/build/macos/Build/Products/Debug/desktop_webview_auth/desktop_webview_auth.framework/Modules/desktop_webview_auth.swiftmodule/arm64-apple-macos.swiftmodule
import desktop_webview_auth
^
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'AppAuth-AppAuthCore_Privacy' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'GTMSessionFetcher-GTMSessionFetcher_Core_Privacy' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'GTMSessionFetcher-GTMSessionFetcher_Full_Privacy' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'AppAuth' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'GTMSessionFetcher' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'GTMAppAuth-GTMAppAuth_Privacy' from project 'Pods')
/Users/user/Dev/flutter-codelabs/firebase-auth-flutterfire-ui/complete/macos/Pods/Pods.xcodeproj: warning: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 10.13 to 15.2.99. (in target 'GTMAppAuth' from project 'Pods')
** BUILD FAILED **

Error: Build process failed

Exited (1).

Expected fix

No response

Additional context

Running on MacOS 15.3, flutter and flutterfire all updated to latest.

I would like to fix this problem.

• I will try and fix this problem on docs.flutter.dev.

[sfshaza2]

@ericwindmill, can you take a look?

[ericwindmill]

@lsman333 The problem you're seeing is with configuration. Did you create a new Firebase project and follow the steps to configure the platforms?

The StackOverflow link contains many different solutions. Did you try the ones related to flutter clean and google-services.json? I don't believe you need to change any Dart code.

[lsman333]

I tried it a few times, first following step-by-step, and then running the examples from /complete. I will try it again in the next couple of days from the beginning if I have time and check again.

I used the top-rated answer from the StackOverflow:

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

await Firebase.initializeApp(
name: "dev project",
options: DefaultFirebaseOptions.currentPlatform);

So after I did this change, I was able to deploy successfully to Android, but then other platforms stopped functioning.

[ericwindmill]

It's not correct to use the 'name' parameter in this situation. Thats likely the top rated answer because its a quick bandaid, but if you're trying to use multiple platforms it will break your app. I suggest reading comments further down that answer that have to do with flutter clean and fixing platform configuration (like fixing google-services.plist on iOS).

I'm closing this issue, because this is not an issue with the codelab. I suggest asking a question on the Flutter Forum for individualized help.