Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 89277087eba6afad28d8fff479c6666c5b21e3d5cf9dc444e209f6af3f91976e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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