We presume there is a minor problem in FW however I don't think it effects anything. There is nothing we can fix for it here in the forums or on your router.
DLinks error codes are mostly internal for diagnostic purposes and not available to the public.
Are you experiencing problems with your router? If so, please post the problems you are having and we'll help you get them fixed if we can. Any problems that can not be fixed here in the forums, you'll need to phone contact DLink support.