Android Studio: Android Manifest doesn't exists or has incorrect root tag

On Android Studio v0.8.2 clicking on Sync project with Gradle files button solved my problem.

update

Thanks to the comment of jaumard. If the Sync project with Gradle files it's not visible you have to open the Gradle panel and click sync icon on top the toolbar.

Hope it helps :)

Just call (in any case) File -> Invalidate Caches and Restart....

In my case:

settings.gradle file was empty. I added defualt code:

include ':app'

Then I clicked

Then project start works.