Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c84ca7a5abaeb455d1f5efb7caf3eb9ae460070c62f614d399adf1a664c063f5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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