This message "The following classes could not be instantiated:
- android.support.design.widget.CoordinatorLayout (Open Class, Show Exception, Clear Cache)
- android.support.design.widget.AppBarLayout (Open Class, Show Exception, Clear Cache)

appears whenever I attempt to change my theme from anything but "AppTheme.NoActionBar.
I believe this is also causing issues when I attempt to start dragging widgets onto the app.
Any suggestions?