Cannot resolve symbol Theme, ThemeOverlay

Question

I updated my android studio to latest version - 3.0.1. Since then it complains \'Cannot resolve symbol\' for Theme and ThemeOverlay in the following lines of code. App runs

Answer 1

1. In the app/build.gradle remove the line responsible for the appcompat package (something like implementation 'com.android.support:appcompat-v7:27.1.1')
2. Perform the Gradle sync. It will break and show a lot of errors
3. Bring the original line back
4. Perform the Gradle sync once again

This will magically solve the problem that for no reason appeared in the 3.0.1