Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df22fadcbbe4d1329bce2a18706043a180bb1a41aaabc330c320ae7972d9cc59:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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