In build.gradle(app) dependencies:
compile 'com.google.firebase:firebase-database:11.0.4'
compile 'com.google.firebase:firebase-auth:11.0.4'
This is the line that causes failure (without this line, it syncs without any problems)
compile 'com.firebaseui:firebase-ui-auth:2.1.1'
Error messages:
Failed to resolve: com.android.support:customtabs:25.4.0
Failed to resolve: com.android.support.constraint:constraint-layout:1.1.0-beta1
Failed to resolve: com.android.support:design:25.4.0
Failed to resolve: com.android.support:cardview-v7:25.4.0