Cannot resolve symbol 'Theme' in styles.xml (Android Studio)

Question

Since today, Android Studio can\'t find the AppCompat themes in styles.xml, but for example AppCompatActivity in code does get recognized. My Android Studio version

Answer 1

I changed my gradle version from

classpath 'com.android.tools.build:gradle:2.3.0'

to

classpath 'com.android.tools.build:gradle:2.2.3'

and it works now!