Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d4aac2fdc79483d97e8d1c086b28f586a3493653aa99c45a6cfabfcde3d59429:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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