Error: The item cannot be listed or modified. The title and/or description may contain improper words, or the listing or seller may be in violation of eBay policy.
If you receive the above error, it can be for several different reasons:
a phrase you are using in the title and/or descriptions has triggered an automated rejection of this listing
there is something else associated with your seller account that has triggered an automated rejection of this listing
Our friends over at Frooition have a thorough overview of this issue and ways to correct it. If you do not find an obvious solution, we recommend contacting eBay (shortcut to contact by phone for listing issues).