Please see bellow some reasons why this error shows up:

• If you are a new eBay seller, you may need to manually add your first listing on your store.
• You have improper or prohibited eBay terms in your listing
• Your Seller Account does not have enough positive feedback
• Your Seller Account may require acceptance of new eBay terms
• You are trying to list an Auction with a quantity higher ‘1’
• Use of email address and/or ‘@’ anywhere in your listing
• Incorrect ‘Category’ assignment
• Automatic Payment Method Missing or PayPal account on hold.
  Check each of the points above and retry the listing.