The UE5 C2338 error (Your class is missing GENERATED_BODY()) occurs when a UObject or AActor-derived class doesn’t include the GENERATED_BODY() macro. This macro is essential for Unreal’s reflection system. To fix this, add GENERATED_BODY() inside your class declaration. For example:

UCLASS()  
class MYPROJECT_API AMyActor : public AActor {  
  GENERATED_BODY()  
};  

This resolves the Unreal Engine 5 reflection error and ensures your class compiles correctly.