UE4 Compile error with UFUNCTION(NetMulticast). error LNK2005: “public: void __cdecl *::*(void)” (?*@*@@QEAAXXZ) already defined in *.cpp.obj

Question

MyActor.h

UCLASS()
class FPS_API AMyActor: public AActor
{
    GENERATED_BODY()
...
public:
    UFUNCTION(NetMulticast, Reliable)
    void MulticastRPCMyFunct