Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bf01b7545fbffbff4bba3e8147d8da0edede013a4d02b4c85dabc1173dd0608c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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