The way to repair "Did not load AppCompat ActionBar with unknown error" in Android Studio 3.1.3
Did not load AppCompat ActionBar with unknown error.
Android Studio 3.1.3
com.android.assist:appcompat-v7:28.0.0-alpha3
source
Did not load AppCompat ActionBar with unknown error.
Android Studio 3.1.3
com.android.assist:appcompat-v7:28.0.0-alpha3
source