Uncaught Exception BadMethodCallException: "Items must be saved before adding to a changeset"

[schrattenholz]

Hi I get that error using BulkUploader in SS4.3

Uncaught Exception BadMethodCallException: "Items must be saved before adding to a changeset"

That s my gridfield-config

$gridFieldConfig=GridFieldConfig::create()
->addComponent(new GridFieldButtonRow('before'))
->addComponent($dataColumn=new GridFieldDataColumns)
->addComponent(new GridFieldDeleteAction())
->addComponent(new GridFieldEditButton())
->addComponent(new GridFieldDetailForm())
->addComponent(new GridFieldSortableHeader())
->addComponent(new GridFieldFilterHeader())
->addComponent(new GridFieldPaginator())
->addComponent(new GridFieldAddNewButton())
->addComponent($bulkUploader=new \Colymba\BulkUpload\BulkUploader('Image'))

The DataObject

use Silverstripe\ORM\DataObject;
use Silverstripe\Assets\Image;

class GalleryImage extends DataObject{
	private static $table_name="galleryimage";
	private static $db=[
		"SortID"=>"Int"
	];
	private static $has_one=[
		"Image"=>Image::class,
	];
	private static $belongs_many_many=[
		"Galleries"=>Gallery::class
	];
	public function onAfterWrite()
	{
			$this->Image()->doPublish();
	}
	public function getThumbnail(){
		return $this->Image()->CMSThumbnail();
	}
}	

		;