Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7b8b8ca18f42d7288706d6649047158528fc4e750623cac6872d62a7375d6897:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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