Hi Hollyw15,
Sure. In order to contact our customer support team, please visit the following link, http://www.auctiva.com/free-auction-software-help/help.aspx, and click the "File a Support Request" link on the right-hand side of the page. Our customer support staff will be able to look up the exact error message that was returned by eBay in response to your failed postings and point you in the right direction.
-Mike