Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0cb9ffe2896cfb0dc631843954e4cf369a6a644d2419c8f9138b889302315d0a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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