Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3fbf782d0ca4c29c4a5cb2f2b247a19fc28a4127ead2ca50bac011bc62e3d14f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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