Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 229d3e6d72a9a9cb40dad29ddaf56c21d78078686fb74ef66cee2d70ed9c8c25:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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