Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4a56f097cc970d528d48a6c9a18ddb1f0041df97f9ffa6d6ee34df6fc09d908a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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