* What went wrong:
Execution failed for task ':app:DownloadSources'.
> Could not resolve all files for configuration ':app:downloadSources_927fef28-7488-4483-9527-5596851d39e8'.
> Could not find com.google.android.exoplayer:exoplayer-core:2.16.1@aar.
Required by:
project :app
I am unable to download sources for any of the library, once I click on download sources, I get the above error.
(Note : None of the existing answers worked for me, either they are obsolete (or) had some other error.)