Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5b887c8b0144e09c816fbc04323cdac407b682fdd6ed851df98e931ec9d7f694:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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