Firebaseui-android: Code:12500 when using 'Sign in with Google'

[avyx7]

hello guys,
The app is running on my mobile device. While pressing 'Sign in with Google' it gives a toast message 'Code:12500'

[irwinOT]

so?

[MoacirSchmidt]

Usually this error is related to:

1) Missing or misconfigured google-services plugin for gradle. See https://developers.google.com/android/guides/google-services-plugin

2) Outdated google-services.json file. Download an updated copy from firebase console

3) Not signed APK

[twiceyuan]

There is another possible reason: you did not enable the Google sign-in option in the Firebase Console