Error Code 21919067
The listing violates the Duplicate Listing policy. The Product you created is already listed on eBay. eBay doesn't allow listings for identical items from the same seller to appear on eBay at the same time.
Solution
- Delete and Recreate this product
- Download unmanaged items from import from eBay (top right)
If you'd like to list more than one of the same item, create a multi-quantity fixed price listing.