problem loading assets in package

Development Programming & Scripting C++
1

hi forum i have a issue with this

i have a class to instance a UStaticMeshComponent* and loads a mesh inside; editor works perfect but in package dont work
i evalute with FStringAssetReference i have no NULL mesh but dont display nothing, is this a bug?
this is my sample code of the constructor



AMyPawn::AMyPawn()
{
	pivotComponent = CreateDefaultSubobject<USceneComponent>("Pivot");
	RootComponent = pivotComponent;


	plane= CreateDefaultSubobject<UStaticMeshComponent>("Plane");


#define LM_ASSETS_FOLDER TEXT("/Meshes")


	UStaticMesh* planeMesh = ConstructorHelpers::FObjectFinder<UStaticMesh>(LM_ASSETS_FOLDER TEXT("/Plane")).Object;
	if (plane != NULL)
	{
		Plane->SetStaticMesh(planeMesh );
		//y = width, z = height
		Plane->SetRelativeScale3D(FVector(1, 640, 480));
		Plane->SetRelativeLocation(FVector(660, 0, 0));
	}


}

and now in the begin play i find them



void AMyPawn::BeginPlay()
{
     Super::BeginPlay();
FStringAssetReference thePath = FStringAssetReference(Plane->StaticMesh);

	if (!thePath.IsValid())
	{
		GEngine->AddOnScreenDebugMessage(-1, 10, FColor::Red, thePath.ToString());
	}

}

is working and print the right path in package but is loading nothing! what is wrong here? i am overhelmet with this