Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ee45ee1a0a564b9dd0a37d1ab2e553412dfd047ef707fc26d7f1638d60882e83:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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