here is the answer the y gave me,
Thanks for contacting us regarding this matter, and I'm sorry for the inconvenience. Unfortunately at this time due to a server issue some of our users are reporting issues in posting to ebay. We are aware of this issue, and are working to get it resolved as soon as possible. In the meantime please wait for those items to fail before trying to post your listings again. We will make sure to let you know when this issue is resolved. If you have any other questions, please feel free to ask.