Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 396894858b54619ee26f01b4414c718a93c8913df8684d09c2f9937eafb7956e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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