I attempt to upgrade the Cloudinary android lib to com.cloudinary:cloudinary-android:1.21.0, and then get the following message while gradle project building:
Error:Could not find com.android.support:support-core-utils:26.0.1.
Required by:
project :appfriendscore > com.cloudinary:cloudinary-android:1.21.0
Why does it occur and how to resolve.