thank you for replying.
UCLASS(ClassGroup = (Custom), meta = (BlueprintSpawnableComponent))
class GAMEPROTOTYPE_API USkillCastingComponent : public UActorComponent
and in the character class:
/** Skill Casting Component */
UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Custom, meta = (AllowPrivateAccess = "true"))
class USkillCastingComponent* SkillCastinggComponent;