Forward declare

I try to edit it

Class 'APickupItem' must inherit UObject or a UObject-derived class	prototip1	...\prototip1Character.h	1	

and there’re changes in the code

UCLASS()
class APickupItem; // forward declare the APickupItem class,
				   // since it will be "mentioned" in a member function
decl below

class Aprototip1Character : public ACharacter

Unfortunately, I don’t understand how to make inheritance