The Android Studio 3.1 layout preview fails to find style \'coordinatorLayoutStyle\' in the current theme.
Failed to instantiated one or more classes.
Excep
This appears to be a bug in the current version of Android Studio (3.1.3) as I was encountering the same thing. I downloaded the beta build from here and opened my existing project and the errors disappeared.
https://developer.android.com/studio/preview/?utm_source=android-studio
Not exactly a fix but hopefully it will get you back up and running.