UBlueprintAsyncActionBase Problem :A null object was passed as a world context object to UEngine::GetWorldFromContextObject().

[q244645787 (HWSLandDFTX8)]

I tried to make asynchronous nodes.
But after making it and running it, there was a warning.
this is my code:
.h:

UCLASS()
class TIMEMANAGERPLUGINS_API UCustomAsync : public UBlueprintAsyncActionBase
{
	GENERATED_BODY()
public:
	virtual void Activate() override;
	virtual TStatId GetStatId() const;

public:
	UPROPERTY(BlueprintAssignable)
	FCustomAsync OnTime;
	UPROPERTY(BlueprintAssignable)
	FCustomAsync OnFinish;
private:
	float CurrentTime = 0;

	float AllTimerTime = 0;
	bool bForwardTimer = false;
	int32 AsyncCounter = 0;
	ETimer Timer = ETimer::Pause;
	FTimerHandle TimerHandle;
	const UObject* WorldContextObject;
public:

	UFUNCTION(BlueprintCallable, meta = (BlueprintInternalUseOnly = "true", WorldContext = "WorldContextObject"),Category="TimeMangerPlugins| Timer")
	static UCustomAsync* StartClock(UObject* WorldContextObject, bool bForward,float SecondsTime);
};

.cpp

void UCustomAsync::Activate()
{
}


TStatId UCustomAsync::GetStatId() const
{
	return TStatId();
}

UCustomAsync* UCustomAsync::StartClock(UObject* WorldContextObject, bool bForward, float SecondsTime)
{
	if (!WorldContextObject)
	{
		FFrame::KismetExecutionMessage(TEXT("Invalid WorldContextObject. Cannot execute Set Timer."), ELogVerbosity::Error);
		return nullptr;
	}
	if (SecondsTime<=0)
	{
		FFrame::KismetExecutionMessage(TEXT("Invalid WorldContextObject. SecondsTime <=0 is error!!!"), ELogVerbosity::Error);
		return nullptr;
	}
	
	UCustomAsync* Node = NewObject<UCustomAsync>();
	Node->WorldContextObject = WorldContextObject;
	Node->AllTimerTime = SecondsTime;
	Node->bForwardTimer = bForward;
	
	auto TimeCheck = [Node, WorldContextObject]()
	{
		Node->CurrentTime += 0.1;
		if (Node->CurrentTime >= Node->AllTimerTime)
		{
			Node->OnFinish.Broadcast(Node->CurrentTime);
			Node->WorldContextObject->GetWorld()->GetTimerManager().ClearTimer(Node->TimerHandle);
		}
		if (Node->bForwardTimer)
		{
			Node->OnTime.Broadcast(Node->CurrentTime);
		}
		else
		{
			Node->OnTime.Broadcast((Node->AllTimerTime) - (Node->CurrentTime));
		}
		
	};

	Node->WorldContextObject->GetWorld()->GetTimerManager().SetTimer(Node->TimerHandle, FTimerDelegate::CreateLambda(TimeCheck), 0.1f, true);
	return Node;
}

I am not find problem,But when I tried to run the blueprint:

I do not know why.

[q244645787 (HWSLandDFTX8)]

I forgot which functions I used and now this error occurs even when an empty scenario is run!

[q244645787 (HWSLandDFTX8)]

I Know why ,this is not problem ,problem is plugins is bad !