Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 72a4b8418abed7f357640353bd9fd85ee5303c3c39ba5b40943ef64deb1c8647:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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