Why is CreateWidget an undeclared identifier?

Development Programming & Scripting UI
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1

I am trying to use a UserWidget blueprint as my HUD. Nevertheless, “CreateWidget” is marked as an undeclared identifier. Why could that be? I already added UMG, Slate, and SlateCore dependency modules.

The following is in my header file:

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "HUD")
TSubclassOf<class UUserWidget>HUDWidgetClass;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "HUD")
class UUserWidget* HUDWidget;

The following is in my .cpp file inside the BeginPlay() function:

if (HUDWidgetClass){
	HUDWidget = CreateWidget<UUserWidget>(this, HUDWidgetClass);
	HUDWidget->AddToViewport();
	HUDWidget->SetVisibility(ESlateVisibility::Visible);
}
2

.h file

#include "Blueprint/WidgetTree.h"

.cpp file

HUDWidget = Cast<UUserWidget>(CreateWidget(GetWorld(), HUDWidgetClass);

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