UPROPERTY() does not work before declaring a variable of type UPhysicalMaterial

[Griev]

UPROPERTY() does not work before declaring a variable of type UPhysicalMaterial. If i

If I set UPROPERTY() or UPROPERTY (EditDefaultsOnly) then the code does not compile and throw the error “unresolved external symbol”

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/PrimitiveComponent.h"
#include "PhysicalMaterials/PhysicalMaterial.h"
#include "Pickup.generated.h"

UCLASS()    
class QUERRY_API APickup : public AActor, public IInteractionInterface
{
	GENERATED_BODY()
public:	
    UPROPERTY(EditDefaultsOnly)
    UPhysicalMaterial* Ph__Material;
	APickup();

[3dRaven]

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/PrimitiveComponent.h"
#include "PhysicalMaterials/PhysicalMaterial.h"
#include "Pickup.generated.h"

class UPhysicalMaterial;

UCLASS()    
class QUERRY_API APickup : public AActor, public IInteractionInterface
{
	GENERATED_BODY()
public:	
    UPROPERTY(EditDefaultsOnly)
    UPhysicalMaterial* Ph__Material;
	APickup();

Then include it’s header #include "PhysicalMaterials/PhysicalMaterial.h" in the cpp and add PhysicsCore to your build.cs dependencies.

[AlienRenders]

Did you add the PhysicsCore module to your build.cs file?

edit: Ah, 3dRaven beat me to it as I was writing my response. lol