Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> acab245b38bff052b08fd9cbd61a7815db9db3e9acb5dbca83199bf3e42992da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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