Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5bb6eeef15aa654ba1213c1da13d279b4488964c83eeb2d428ea977c6cb6aae9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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