Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5594954fccc04e426c8b7286af5baf74268933f3746a24b65205e36790e9a746:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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