Since JCenter is already obsolete, we will get an error when we try to use JCenter( e.g. project using Facebook SDK for Android).
This issue can be solved by adding mavenCentral() to the repositories of build.gradle in Engine \Build\Android\Java\ gradle.
Note: See comment about deleting cached com.facebook.android !
Set up an Android project
Package for Android
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-151839 in the post.