Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 94f62755f50c247f29308752102288b5a3349efd1b9293754362c1a495a23877:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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