:app:checkDebugDuplicateClasses Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0) Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime ..