Android studio cannot resolve but build successfully after update

Question

It's start after I update Android studio to version 3.1 stable, then I open my project, Android studio start to complain that can't resolve bla bla bla... (many import become red)

What I did so far :

1. Sync gradle
2. Clean build then rebuild
3. Invalidate cache and restart
4. Deleting .gradle folder in project
5. Deleting .gradle/cache folder in user folder (i'm on Windows)
6. Uninstall and reinstall Android studio

But so far the issue is not resolved, some things to note :

1. I use kotlin
2. I still can build and deploy the apk
3. The unresolved reference seems only on library that I added on gradle
4. If I downgrade or upgrade the library, this seems fix the problem, but when I back to the original library version the issue came back.

Answer 1

1. Exit from Studio
2. Delete .idea/, build/, app/build/ directories.
3. Start Studio.
4. Re-setup Settings->Build tools->Gradle to use local distribution (last stable Gradle locally installed)

Helps me.