Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 803402bc0b95d222b67c2d917ec6a46cbb056b6a18ced9e5b7bf9736018c0b49:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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