Hi yesteryearz,
If you open this listing from your "Saved Listings" page and click the "Error Check" button, the exact reason this listing cannnot be posted should be displayed in a red box, similart to the one you pasted in your original post, at the top of the lister page.
If you are unable to determine the reason your listing cannot be posted using this method, please file a support request using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike