[Editor Extension] Cast Error

Development Programming & Scripting Blueprint
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1

I am trying to extend the editor and create a Blueprint with a custom actor parent class.

The menu extension button launches this code:

FString NameStr = "/Game/Blueprint";
UPackage* myPackage = CreatePackage(NULL, *NameStr);

AMyClass* myClass = NewObject<AMyClass>();

UBlueprintFactory* myFactory = NewObject<UBlueprintFactory>();

UBlueprint* myBP = Cast<UBlueprint>(myFactory->FactoryCreateNew(UBlueprint::StaticClass(), myPackage, FName("MyInfo"), RF_Public | RF_Standalone, NULL, GWarn));

	if (myBP)
	{
		myBP->ParentClass = myClass->StaticClass();
		 //Notify the asset registry
		FAssetRegistryModule::AssetCreated(myBP);
		 //Mark the package dirty...
		myBP->MarkPackageDirty();
		
	}

If I just use AActor as the parent class it works fine, so I guess the problem lies with my custom actor class.

MyClass.h:

UCLASS(Blueprintable, NonTransient)
class AMyClass : public AActor
{
	GENERATED_BODY()

public:
AMyClass(const FObjectInitializer& ObjectInitializer);

};

MyClass.cpp:

AMyClass::AMyClass(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
}

Everything compiles fine, but when I click the menu button I get the following error:

Cast of Package /Engine/Transient to Level failed

Any ideas as to why this is happening or how to fix?

Thanks in advance!

-Tim