I've been getting this unbearable error, I've been rounding it up a while ago in my project since I back up the app, sometimes it works, when it did not work I had to make a backup, and I do not know why it worked, this time I did not do the backup so I need to solve this problem.
It happened when I downloaded the Youtube zip in the libs folder, that I got around, now the error returned when I put the Appodeal zip in the libs folder, Thanks in advance!
Update
I found that Rebuild works for this error.