Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e60a05739e024246f72dfa4c0385c33a3c55ba5013b0dda282358c8f7817919b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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