Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7c525b8ffa9625cc9515dc53a05e0c3d35b69e8cca78e727c06912104dc7175b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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