I try to spawn a custom actor using C++,but it do not work,is there someone can help me?thanks!

Development Programming & Scripting C++
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yes,i use ue4.7.3, here is the spawn code,it trigger by key event:
UPROPERTY(EditDefaultsOnly, Category = Placeable)
TSubclassOf PlaceableActorClass;

UWorld* const World = GetWorld();
World->SpawnActor(PlaceableActorClass, SpawnLocation, SpawnRotation);