Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3bb1d102bf81c088a16064b6d42d728f7bd733bf52b6bb1e53b3158224847585:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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