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Spawning An Actor Whithin Another Results in Crash

I have the following classes:


   #pragma once
   #include "GameFramework/Actor.h"
   #include "Hand.generated.h"
     UCLASS(Within = Arm)
     class AHand : public AActor


 #pragma once
     #include "GameFramework/Actor.h"
     #include "Hand.h"
     #include "Arm.generated.h"
     class AArm : public AActor
             void createHand();
             AHand * handPart;


 void AArm::createHand()
      FActorSpawnParameters spawnInfo;
      spawnInfo.Owner = this;
      handPart = GetWorld()->SpawnActor<AHand>(spawnInfo);

This compiles fine, but when I run AArm::createHand() during runtime the game crashes. I get this error message in the Log:

[2014.07.21-03.11.48:269][638]LogWindows: === Critical error: === Unhandled Exception: 0x00000001 [2014.07.21-03.11.48:270][638]LogWindows: Object Hand Hand created in Level instead of Arm

If I change UCLASS(Within = Arm) to UCLASS() in Hand.h, no crash occurs.

Why am I crashing and how do I fix it? Thanks!

Product Version: Not Selected
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asked Jul 21 '14 at 03:52 AM in C++ Programming

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