Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5517bb996a85da908383db8bc3448237e46dae803c632ec235be6d077c81b41:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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