Beginning Firebase · References | Ray Wenderlich

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When I try to run my project after creating those references, I get:

Terminating app due to uncaught exception 'FIRAppNotConfigured', reason: 'Failed to get default Firebase Database instance. Must call [FIRApp configure] (FirebaseApp.configure() in Swift) before using Firebase Database.'

@bdmoakley Can you please help with this when you get a chance? Thank you - much appreciated! :]