Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d28ce33b86babc363609863471da28e45f640b9dfe9aae7afd239e4827759513:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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