Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 43cf96785e9fe08967b4fdf200c8d4d852714ae7eedc58751472c1cef47bbb95:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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