Widget Blueprint could not be loaded because it derives from an invalid class. Check to make sure the parent class for this blueprint hasn't been removed!

Tried migrating a settings menu that has a normal parent class of commonactivatablewidget but the parent class gets removed and set to none. i dont understand whats happening considering its a default engine parent class.

CommonActivatableWidget is part of the CommonUI plugin. Enable it, restart the editor and try opening the widget.