Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3f4e575b11673b6d7f4e47e68597ff754857475d040ee2e49f3cef091ef6fe8c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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