Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9296877e02d6181fd74eeebe80166c7faff51e7c4a05d816fd9e1c3d8eb079f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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