Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 47b5765ffbc1d49bafcfec02d8ab02be41b193295ef17f4c97e119221975e5be:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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