Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cdfc16eda46dd20530cb08c7081e4ade2858a89818cca5990bec2c2090957e99:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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