Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c69bfa01a16812284e668a0ff75b87e3457d9316af43146a7a8271ece6d3ff3a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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