Android Studio - Cannot resolve symbol themes, colorprimary,

Question

I am seeing in Android Studio 3.1.2 an error for AppCompat themes and colors attributes like attr/colorPrimary.

But only in Android Studio. Compile and run does work.

For example:

My app.gradle:

supportLibVersion is 27.1.1!

Answer 1

This helped in the similar problem. Maybe this help you:

Close the project from the File menu. Then open the project again as existing Android Studio project.

Answer 2

I posted my answer on link mentioned by V.March. Basicly Invalidate Caches / Restart solved my problem