The default app has not been configured yet

Question

I\'m trying to upgrade my app to the new version of Firebase. I went through the setup guide and edited all of my code to match the new syntax. However, when I run the app,

Answer 1

I'm also using Fabric and in my case it was the order of Fabric and Firebase initializations. I had to initialize Firebase first.

So changing

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    Fabric.with([Crashlytics.self])
    FirebaseApp.configure()
    ...
}

to:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    Fabric.with([Crashlytics.self])
    ...
}

fixed the problem.