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LevelPluginLog:Error: OnMountPak is not bound ，why?

Development Discussion Blueprint Visual Scripting
#1

LevelPluginLog:Error: OnMountPak is not bound
LogScript:Warning: Accessed None trying to read property ActorPaks
PaksModelShop_C /Engine/Transient.UnrealEdEngine_0:MMOInstance_C_1.FullUI_C_0.WidgetTree_2161.ChushouM
Function /Game/MMO/Blueprints/Shop/PaksModelShop.PaksModelShop_C:ExecuteUbergraph_PaksModelShop:0020
LogScript:Warning: Accessed None
PaksModelShop_C /Engine/Transient.UnrealEdEngine_0:MMOInstance_C_1.FullUI_C_0.WidgetTree_2161.ChushouM
Function /Game/MMO/Blueprints/Shop/PaksModelShop.PaksModelShop_C:ExecuteUbergraph_PaksModelShop:0035

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bool ULevelLoaderObject::AlternateLoadLevelFromPak(UObject* WorldContextObject, const FString& pakPath, UStaticMesh*& LoadedStaticMesh)
{
UWorld* World = WorldContextObject->GetWorld();

UE_LOG(LevelPluginLog, Log, TEXT("Game Content Dir: %s"), *FPaths::GameContentDir());

if (FCoreDelegates::OnMountPak.IsBound())
{
	if (FCoreDelegates::OnMountPak.Execute(*pakPath, 0, nullptr))
	{
		FStreamableManager AssetLoader;
		FStringAssetReference AssetRef(TEXT("/Engine/dronepackmesh.dronepackmesh"));
		LoadedStaticMesh = Cast<UStaticMesh>(AssetLoader.SynchronousLoad(AssetRef));

		AStaticMeshActor* actor = World->SpawnActor<AStaticMeshActor>(FVector::ZeroVector, FRotator::ZeroRotator);
		actor->GetStaticMeshComponent()->Mobility = EComponentMobility::Movable;
		actor->GetStaticMeshComponent()->SetStaticMesh(LoadedStaticMesh);

		UE_LOG(LevelPluginLog, Log, TEXT("Pak successfully mounted"));
	}
	else
		UE_LOG(LevelPluginLog, Error, TEXT("Pak failed to mount"));
}
else
	UE_LOG(LevelPluginLog, Error, TEXT("OnMountPak is not bound"));

return true;

}

#2

LevelPluginLog:Error: OnMountPak is not bound ，why?

#3

Are you running from PIE? If so then OnMountPak will probably not be bound. At least that was true at one time. Need to run standalone or packaged code.