Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4394516164323ba1446cbe2df3e0c08d5647ea6f1e3a99c8f41455a24914616e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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