normally you should contact the support folks but this is easy
what that means is that your listing in the Closed Folder is older than 90 days. So it won't re-list.
I have begged Auctiva to change that and if eBay returns that API message to go and List the item normally.
When you edit your Closed Listing it has everything it needs to do a normal listing as it looks exactly like any listing in your Saved Folder so the change should be straightforward. Sadly it appears that there is something in Auctiva's design that makes this not straightforward. Or at least I have to assume that as I never received a response
ed