Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4d91dc7c060b91ceb3c4a836829cdd07de242459e1be6f6ba30cd9a61447c266:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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