Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e4f8eef6f1c3d1a901e18ffa706e21bc87aab05b5c1e207775793c51cb0baaf5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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