Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6c151da711c925b553ce9e4c5281509d84add6c6ece17b427cd1ea5cca431881:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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