Custom asset class could not be found after editor restart

Development Programming & Scripting
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1

I created a custom asset for usage in the contend drawer with c++. I am able to import and view the data, but after a editor restart i cant open or edit the asset. The log shows the following message:

LogLinker: Warning: Unable to load dom1_32_306_5714_1_nw_2020 with outer Package /Game/Maps/Geldern/dom1_32_306_5714_1_nw_2020 because its class (UAscAsset) does not exist

Why could the class not be found after a restart of the editor? If i import a new file the new file works also until the next restart of the editor.

My Asset Class:

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

#pragma once

#include "CoreMinimal.h"
#include "UObject/Object.h"
#include "UAscAsset.generated.h"

/**
 * 
 */
UCLASS(BlueprintType)
class ASCPLUGIN_API UAscAsset : public UObject
{
	GENERATED_BODY()

public:
	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	int NCols;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	int NRows;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	double XLL;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	double YLL;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	bool IsCellCenter; // if not cell center, then cell corner

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	int CellSize;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	// Optional NO DATA value
	int NoDataValue;

	UPROPERTY(BlueprintReadOnly, Category = "ASC Info")
	TArray<float> Data;
};