Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a75b1e0de024d5ecb83d84af98382ced82571e395b64e5da7ea9b7d3045f71d2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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