Hello Leattique -
The message you report is an API error that came from eBay when we attempted to post your listing. There are a variety of reasons that this error message can occur, but we'd need to have a look in your account directly and at the saved listing to be able to determine what may have triggered that response from eBay's API.
Please file a support case letting our support team know that you've run into this issue so they can review it within your account to assist you.
- Craig