Why can't I inherit from UUserWidget?

Development Programming & Scripting UI
, ,
1

I just upgraded from Unreal Engine 4 to Unreal Engine 5.3.1, and I’ve run into an issue with inheriting from UUserWidget. I managed to isolate all the issues to anytime I try to inherit from UUserWidget (deleting these solves the problems, and I can compile).

I even was able to reproduce the issues with a very minimal example (posted below).

This is a picture of all the errors it generates: https://puu.sh/JR1rV/ee068ec042.png

    #pragma once
    
    #include "CoreMinimal.h"
    #include "Blueprint/UserWidget.h"
    #include "View_Basic.generated.h"
    
    /**
     * 
     */
    UCLASS()
    class TESTGAME_API UView_Basic : public UUserWidget
    {
    	GENERATED_BODY()
    };
2

Figured it out by comparing a new project to a UE4 upgraded project…

In Target.cs (including Editor version) needs to have

DefaultBuildSettings = BuildSettingsVersion.V4;