If this does not solve your problem, you may have an invalid cache. You can solve this problem by invalidating the cache.
Select File , then Invalidate Caches / Restart ... in the menu, then Invalidate and Restart .
Note. this solution will delete the cache, including local history, for all projects.
This is also explained in https://stackoverflow.com/a/3/412/
Wilt Jun 24 '14 at 9:04 2014-06-24 09:04
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