Android Studio “cannot resolve symbol” but project compiles and works

Question

The project compiles fine. However, Android studio 3.0.1 shows reference to one particular library in red and displays \"cannot resolve symbol\". Even single stepping into

Answer 1

I've tried Invalidate Caches/Restart..., tried manually delete .idea and .build folders and it didn't work for my case. I using VCS (git) and I just commit my changes, removed the whole project, and Checkout from Version Control. It fixed this problem.

Android Studio 3.6.3