Suggestion and error checking are not working

Answered

Running "Invalidate Caches" does not help. I tried a lot of things, but nothing helped. 
Writes that indexing is going on, but nothing happens after completion.
Screenshots:

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Can you please prepare and provide a small project sample illustrating the problem? 

The files can be uploaded at https://uploads.jetbrains.com (do not forget to specify the UploadID)

Make sure that Sources Root is properly configured.

Thank you!

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