Why can't I edit exposed variable in Blueprint?

Development Programming & Scripting Blueprint
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1

Hello,
I’m trying to get a hold of blueprints and exposing variables to them, however I cannot get my variable to be editable from a blueprint I made of a basic class.

#pragma once

#include "GameFramework/Actor.h"
#include "HelloWorldPrinter.generated.h"

/**
 * 
 */
UCLASS(BlueprintType, Blueprintable)
class AHelloWorldPrinter : public AActor
{
public:
    GENERATED_UCLASS_BODY()

    UPROPERTY(BlueprintReadWrite, EditDefaultsOnly, Category=Actor)
    uint32 MyNumber;
public:
    virtual void BeginPlay() OVERRIDE;
	
};

The variable shows up but it the box is greyed out. I’ve found this wiki article but I don’t think it really details what I’ve done wrong. Any ideas?

2

I’m not entirely sure why, but changing MyNumber from a uint32, which I assume is an unsigned integer, to a int32 solved the problem.

3

I’m having this same problem, too: uint32’s can’t be changed. Unfortunately, changing the value to an unsigned int isn’t possible.