Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1c5740f237f25f82e98ee415f04f6928ceaf1162e1b93cb11559a5c51ba1a137:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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