Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cc457c9a12b59ce8839c1bf19ef61c8c37a1c9996681ff8d49850a58c81d09d2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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