mattandleah,
You are getting a warning, not a failure. This is because eBay has started issuing warnings for listings with items in categories that use their new item condition designations. They will continue to accept (and warn on listings) with the old item conditions up to July 27, at which time they will require new listings and revisions to listings use the new item conditions.
We will have the Auctiva site updated in early June (which is well before the July 27 deadline) so that users can (and will be required) to enter the new item conditions. In addition, we will be providing a tool to allow you to convert your saved listings on Auctiva to the new item conditions.
I haven't mentioned good till canceled listings (GTC); those will eventually have to be dealt with if they are affected by the item condition changes, but enforcement of item condition on GTC listings will not be for a while yet...well past July of this year. Here is a link to a
story on Auctiva EDU that gives even more details.
So don't worry about these API warnings for right now...its just eBay letting you know that the new item conditions are rolling out.