Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d0b8d3b1629a6a1d790af08a36b057294e723222fd61098110955a36a9102940:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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