Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 68046d53943419a50d333d1b5fb845dbed3b60f076fca00f0ef202e5b4a4f0bb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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