Android manifest attribute not allowed here
In my case, closing the AndroidManifest.xml AND choosing File > Invalidate Caches / Restart solved the issue.
Not sure why I had to do the last step as well but it sorted out all those errors for me.
Close AndroidManifest — File — Sync Project with Gradle Files. It helped.
P.S. A few months later I met this problem again — googled — found this answer and it didn't help! :D But this time I removed the Android Studio and installed the beta version. It helped.