Keep in mind that our error check is just a preliminary check. eBay has tens of thousands of potential error situations and we check for the most common that we know about. As we find more we keep adding them. eBays error messages are very cryptic. If they were better you'd be able to correct the problems in your listings right now after they errored the first time. One of the things we do is take their horrible messages and turn them into something you can understand. This lowers our support too. It's just that they have a billion different types of errors.