App crashing when using Firebase Auth, reason: 'Default app has already been configured.'

Question

I\'m building my first iOS application, and I am using Firebase to handle authentication, database, etc. I added a sign up screen and used the following code to create a new

Answer 1

For Swift 4

Had the same problem with crashing. When trying to reference from Firebase with a .plist file.

(This fixed my problem.)

Try writing this outside of or within the viewDidLoad method:

1. var ref: DatabaseReference!

Then reference it within the viewDidLoad method:

2. Database.database().reference()

And now it's:

FirebaseApp.configure()

Instead.