"Overloaded member function not found in" error for BlueprintType Interface function

Hi There,

I’ve run into an issue which I’m struggling to understand.
When I try to compile the following code I get the error:

AlsCppV4\ALSInterfaces.gen.cpp(535): error C2511: 'void IALSCharacterInterface::GetCurrentStates(TEnumAsByte<EMovementMode> &,EALSMovementState &,EALSMovementState &,EALSMovementAction &,EALSRotationMode &,EALSGait &,EALSStance &,EALSViewMode &,EALSOverlayState &)': overloaded member function not found in 'IALSCharacterInterface'

Here’s my code:

UINTERFACE(BlueprintType)
class ALSCPPV4_API UALSCharacterInterface : public UInterface
{
	GENERATED_BODY()
};

class ALSCPPV4_API IALSCharacterInterface
{
	GENERATED_BODY()

public:
	
	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterInformation")
		void GetCurrentStates(
			TEnumAsByte<EMovementMode>& PawnMovementMode,
			TEnumAsByte<EALSMovementState>& MovementState,
			TEnumAsByte<EALSMovementState>& PrevMovementState,
			TEnumAsByte<EALSMovementAction>& MovementAction,
			TEnumAsByte<EALSRotationMode>& RotationMode,
			TEnumAsByte<EALSGait>& ActualGait,
			TEnumAsByte<EALSStance>& ActualStance,
			TEnumAsByte<EALSViewMode>& ViewMode,
			TEnumAsByte<EALSOverlayState>& OverlayState
		);
	

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterInformation")
		void GetEssentialValues(
			FVector& Velocity,
			FVector& Acceleration,
			FVector& MovementInput,
			bool& IsMoving,
			bool& HasMovementInput,
			float& Speed,
			float& MovementInputAmount,
			FRotator& AimingRotation,
			float& AimYawValue
		);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetMovementState(EALSMovementState NewMovementState = EALSMovementState::None);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetMovementAction(EALSMovementAction NewMovementAction = EALSMovementAction::None);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetRotationMode(EALSRotationMode NewRotationMode = EALSRotationMode::VelocityDirection);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetGait(EALSGait NewGait = EALSGait::Walking);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetViewMode(EALSViewMode NewViewMode = EALSViewMode::ThirdPerson);

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterStates")
	void SetOverlayState(EALSOverlayState NewOverlayState = EALSOverlayState::Default);
};

I’m not sure why it would be complaining about a function overload when these are just interface declarations?
FYI the referenced enums are also declared in C++, and the header is referenced in this file. The intention behind the “GetCurrentStates” function is to be used in Blueprints (hence the pass by ref).

Any help would be appreciated.

Looks like the generation of the function implementation failed during the build process. Had to change the function signature to the following:

// Interesting, ALSInterfaces.gen.cpp generated incorrectly if enums used TEnumAsByte. Only PawnMovementMode required this.
	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "CharacterInformation")
		void GetCurrentStates(
			TEnumAsByte<EMovementMode>& PawnMovementMode,
			EALSMovementState& MovementState,
			EALSMovementState& PrevMovementState,
			EALSMovementAction& MovementAction,
			EALSRotationMode& RotationMode,
			EALSGait& ActualGait,
			EALSStance& ActualStance,
			EALSViewMode& ViewMode,
			EALSOverlayState& OverlayState
		);