Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b4a7c90ee33df428e3f9ff9dc326635acc6758dd28a13713e95815277bed72c2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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