Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f4cf8a284ca27ee5148956e8c6ad8acedafdffbbd6eb54d503fa3ccd204977da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16