Android Question Errore in Firebase Library Remote Config

I've this error RUN example (Firebase RemoteConfig) or my app

java.lang.NoClassDefFoundError: com.google.firebase.remoteconfig.FirebaseRemoteConfig

The error is generated at Initialize method.

Manifest contain
CreateResourceFromFile(Macro, FirebaseAnalytics.GooglePlayBase)
CreateResourceFromFile(Macro, FirebaseAnalytics.Firebase)
CreateResourceFromFile(Macro, FirebaseNotifications.FirebaseNotifications)
CreateResourceFromFile(Macro, FirebaseAnalytics.FirebaseAnalytics)
CreateResourceFromFile(Macro, FirebaseAuth.FirebaseAuth)
CreateResourceFromFile(Macro, FirebaseAdMob.FirebaseAds)

Someone have the same problem?

Code:

Sub Globals
End Sub

and at Create event

cfg.Initialize("Config")