Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c0844bff002a9c3f8bfa1771a8b90d727943afdda01786598685d4c28c92679d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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