Failed to resolve: com.google.firebase:firebase-core:15.0.0

Question

I have a strange issue when integrate firebase:

Answer 1

Remove the

implementation 'com.google.firebase:firebase-database:16.0.1:15.0.0'

and add only

implementation 'com.google.firebase:firebase-database:16.0.1'

Because 16.0.1 is added by our self and while after that we connect firebase using the plugin in the studio, it adds a new lib file with 15.0.0. So that's not required.