While logged in on the dashboard you see an error under the Product listing problems
"Needs repush to eBay Australia to clear marketplace data error"
This is caused by a transient issue during eBay's processing of the feed. To resolve just click the "Update marketplace" button. This will push a fresh feed file to eBay.
Please contact us on ebaylink@citybeachsoftware.com if you continue to see this error after the feed has been processed.