eBay's messages sometimes do not explain the full issue. It's hard for us to know exactly as we have no access to your account, but if you are a new or returning seller, have you fully and correctly registered for eBay's Managed Payments?
You may be prevented from listing an item, because you have not fully or correctly registered with eBay's Managed Payments.
You need to provide eBay with details of a bank account and have this account verified. The usual method here, is for eBay to send 2 micro deposits into that nominated bank account for you to receive, and confirm to eBay.
Once this is completed, you will be able to list items for sale, and receive payouts from those sales.
This will show you how to register for eBay's Managed Payments.