MovingPlatform.cpp problem with packing gameplay

[Cybercat]

Hiho, I have a problem.

I can export and start the game.
but you can’t play it.

There is an error message that is always related to the movingplatform.cpp.

If I delete all the objects that were created from a movingplatform.cpp, then I can play, but it’s just empty…
I have no idea what that could be
MovingPlatform.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "MovingPlatform.generated.h"

UCLASS()
class OBSTACLEASSAULT_API AMovingPlatform : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AMovingPlatform();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

private:
	
	UPROPERTY(EditAnywhere, Category="Moving")
	FVector PlatformVelocity = FVector(100, 0, 0);

	FVector StartLocation;
	UPROPERTY(EditAnywhere, Category="Moving")
	float MovedDistance = 100;
	
	UPROPERTY(EditAnywhere, Category="Rotation")
	FRotator RotationVelocity = FRotator(0, 0, 0);

	UPROPERTY(EditAnywhere, Category="Setting")
	bool IsMoving = false;
	UPROPERTY(EditAnywhere, Category="Setting")
	bool IsRotate = false;

	void MovePlatform(float DeltaTime);
	void RotatePlatform(float DeltaTime);
	bool ShouldPlatformReturn() const;
	float GetDistanceMoved() const;
	
};

MovingPlatform.cpp from Unreal Engine C++ Course

// Fill out your copyright notice in the Description page of Project Settings.

#include "MovingPlatform.h"

// Sets default values
AMovingPlatform::AMovingPlatform()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void AMovingPlatform::BeginPlay()
{
	Super::BeginPlay();

	StartLocation = GetActorLocation();

	FString Name = GetName();

	UE_LOG(LogTemp, Display, TEXT("BeginPlay: %s"), *Name);
}

// Called every frame
void AMovingPlatform::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);
	if (IsMoving)
	{
		MovePlatform(DeltaTime);
	}
	if (IsRotate)
	{
		RotatePlatform(DeltaTime);
	}
}

void AMovingPlatform::MovePlatform(float DeltaTime)
{
	if (ShouldPlatformReturn())
	{
		FVector MoveDirection = PlatformVelocity.GetSafeNormal();
		StartLocation = StartLocation + MovedDistance*MoveDirection;
		SetActorLocation(StartLocation);
		PlatformVelocity = -PlatformVelocity;
	}
	else
	{
		FVector CurrentLocation=GetActorLocation();
		CurrentLocation=CurrentLocation + DeltaTime*PlatformVelocity;
		SetActorLocation(CurrentLocation);
	}
}

void AMovingPlatform::RotatePlatform(float DeltaTime)
{
	AddActorLocalRotation(RotationVelocity * DeltaTime);
}

bool AMovingPlatform::ShouldPlatformReturn() const
{
	return GetDistanceMoved() > MovedDistance;
}

float AMovingPlatform::GetDistanceMoved() const
{
	return FVector::Dist(StartLocation, GetActorLocation());
}

Error by Game Start

Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 1812] 
ObjectSerializationError: /Game/main (0x7F8912BACDC75769) /Game/main (0x7F8912BACDC75769) - BP_PushingCube_C /Game/main.Main:PersistentLevel.BP_PushingCube_C_8: Bad export index 905969663/322.


0x00007ff6a03931a5 ObstacleAssault.exe!FExportArchive::HandleBadExportIndex() []
0x00007ff6a0379f3f ObstacleAssault.exe!FExportArchive::operator<<() []
0x00007ff6a0360a9c ObstacleAssault.exe!FArchiveUObject::SerializeWeakObjectPtr() []
0x00007ff6a063bbc5 ObstacleAssault.exe!TArrayPrivateFriend::Serialize<TScriptDelegate<FNotThreadSafeNotCheckedDelegateMode>,TSizedDefaultAllocator<32> >() []
0x00007ff6a06a09b7 ObstacleAssault.exe!FMulticastSparseDelegateProperty::SerializeItemInternal() []
0x00007ff6a069e30d ObstacleAssault.exe!FMulticastSparseDelegateProperty::SerializeItem() []
0x00007ff6a0404dfa ObstacleAssault.exe!SerializeUnversionedProperties() []
0x00007ff6a0403f1d ObstacleAssault.exe!UStruct::SerializeTaggedProperties() []
0x00007ff6a05c4c37 ObstacleAssault.exe!UObject::SerializeScriptProperties() []
0x00007ff6a05c3f6a ObstacleAssault.exe!UObject::Serialize() []
0x00007ff6a05c3c80 ObstacleAssault.exe!UObject::Serialize() []
0x00007ff6a5452777 ObstacleAssault.exe!AActor::Serialize() []
0x00007ff6a038870a ObstacleAssault.exe!FAsyncPackage2::EventDrivenSerializeExport() []
0x00007ff6a038b3b0 ObstacleAssault.exe!FAsyncPackage2::Event_ProcessExportBundle() []
0x00007ff6a038c153 ObstacleAssault.exe!FEventLoadNode2::Execute() []
0x00007ff6a038c70d ObstacleAssault.exe!FAsyncLoadEventQueue2::ExecuteSyncLoadEvents() []
0x00007ff6a03a62cc ObstacleAssault.exe!FAsyncLoadingThread2::Run() []
0x00007ff69fff4d68 ObstacleAssault.exe!FRunnableThreadWin::Run() []
0x00007ff69ffe88b7 ObstacleAssault.exe!FRunnableThreadWin::GuardedRun() []
0x00007ffdfd3f7374 KERNEL32.DLL!UnknownFunction []

Crash in runnable thread FAsyncLoadingThread

[Cybercat]

ok nvm.
I have no idea why. but I deleted the binaries folder and now it works.