Please keep in mind that all auctions are binding sales agreements. Failure to honor a sales agreement can result in a bad business infraction that could limit your access to NamePros. While it's unfortunate that the auction didn't end with a higher winning bid, you are still bound to sell the domain.
Please contact the winner in a direct message to initiate the transaction.
If either party (Winner or seller) has any problems in the direct message, please add me to the conversation so I can get more involved.