Integrating FirebaseDatabase, i get "Failed Resolution of ...FirebaseDatabase"

Hi Guys, I'm writing a wrapper of the Firebase Database. I get:

java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/firebase/database/FirebaseDatabase;
at cleverativity.b4a.lib.FirebaseDatabaseWrapper.Initialize(FirebaseDatabaseWrapper.java:24)

I'm using Eclipse to edit the Java code, I've compiled with SimpleLibraryCompiler, I've extracted the FirebaseDatabase.jar from the AAC and everything looks fine. The only thing I didn't do is to modify the test app Manifest like...

Integrating FirebaseDatabase, i get "Failed Resolution of ...FirebaseDatabase"

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