How to add a C++ UUserWidget to HUD?

Development Programming & Scripting UI
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I’ve been trying for ages to load a C++ widget in a C++ HUD. Here’s what I’ve been trying:
SomeHUD.h:

UCLASS()
class SOMETHING_API ASomeHUD : public AHUD
{
	GENERATED_BODY()

public:

	ASomeHUD();
	virtual void BeginPlay() override;

	/** Class of user widget, loaded from Content Browser */
	TSubclassOf<class UUserWidget> WidgetClass;

	/* Reference to created user widget*/
	class UUserWidget* Widget;
	
};

SomeHUD.cpp:

ASomeHUD::ASomeHUD() {
	WidgetClass = UHUDWidget::StaticClass();
}

void ASomeHUD::BeginPlay() {
	Super::BeginPlay();

	if (WidgetClass != NULL) {
		Widget = CreateWidget<UUserWidget>(GetOwningPlayerController(), WidgetClass);

		if (Widget != NULL) {
			Widget->AddToViewport();
			Widget->SetVisibility(ESlateVisibility::Visible);
			if (GEngine) GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Blue, TEXT("Widget Found!"));
		};
	}
	else {
		if (GEngine) GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Widget Class not found!"));
	};
}

For some reason it prints “Widget Class not found” instead of actually viewing it. Am I doing something wrong?

And no, I don’t want to to use blueprints at all.