i got this error in the Action class, copied it exactly from the lesson. I found a workaround solution - removing the ActionData type hints, but i was wondering if it's possible to solve without removing the hints?
Sometimes it happens until you reload the editor. Then, there are limitations to Godot 3's GDScript parser and sometimes you unfortunately just have to remove the hints.
I've noticed some changes and issues regarding type hints with different versions of Godot.