Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ac581d70f0cde56fe031cc3a06e93a56205bbeea027da94ca60230030b4b328:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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