Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a839b17d308699520c8b3f17847ba02bcca245a09135a4e1bb1069fcd6e220f8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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