Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df19e61a5c870e2dd62721b13faedcb9d02bfac3159b85f150bb009e170ef2de:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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