FProcMeshTangent not declared

Hey guys,

i try to create a custom mesh using the UCustomMeshComponent. I have a pretty simple class:

#pragma once

#include "CoreMinimal.h"
#include "CustomMeshComponent.h"
#include "GameFramework/Actor.h"
#include "CustomTestMeshActor.generated.h"

UCLASS()
class TESTPROJECT_API ACustomTestMeshActor : public AActor
{
	GENERATED_BODY()

// Constructor
public:	
	// Sets default values for this actor's properties
	ACustomTestMeshActor();

// Protected functions
protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

// Public functions
public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

// Private members
private:

	UCustomMeshComponent* m_meshComponent;

	TArray<FVector> m_vertices;
	TArray<int32> m_indices;
	TArray<FVector> m_normals;
	TArray<FVector2D> m_uvs;
	TArray<FProcMeshTangent> m_tangents;
};

Unfortunately when i compile the project i get an error, that FProcMeshTangent is not declared. Isn’t it declared in CustomMeshComponent.h? Do i miss something like a aditional include?

Thanks and cheers

DeKande