Cannot resolve symbol '?attr/actionBarSize' after updating Android Studio from 2.3 to 3.0 for buildToolsVersion '26.0.2'

Question

After updating Android Studio from 2.3 to 3.0 I changed buildToolsVersion from 26.0.0 to 26.0.2 and after then I am getting this error:

Cannot reso         


        

Answer 1

In the project directory hierarchy switch "Android" to "Project". Then delete a folder ".idea/libraries", only "libraries". Select an option from the menu "File -> Invalidate Caches / Restart... -> Invalidate and Restart".