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Variable UObject invalid after start

I have a class derived from a UObject defined like this

 UCLASS()
 class MYPROJECT_API UStatistics : public UObject

It has private members and public function to access these members. Every function is a UFUNCTION, so that I can call them inside the blueprint. I have an instance of this class inside another class, defined as follow

 UCLASS()
 class MYPROJECT_API AFirstPlayer : public ACharacter
 {
   [...]
 public:
   UPROPERTY(BlueprintReadOnly)
   UStatistics* Statistics;
 }

In the costructor I initialize this variable as follow

 Statistics = CreateDefaultSubobject<UStatistics>(TEXT("Statistics"));

I created a blueprint from my AFirstPlayer C++ class, but if in the event graph I try to use the Statistics variable, it says that it is invalid. What am I missing? Am I forced to setup an attachment for these variable?

Product Version: UE 4.17
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asked Sep 24 '17 at 03:10 PM in C++ Programming

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astinog
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