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

just in case someone else stumble upon this problem. when use firebase sdk with googleSignIn sdk. you only have to configure them once. either do [[GGLContext sharedInstance] configureWithError: &configureError]; or [FIRApp configure]