Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7c6b1a50c8232a67fe836a8bade1babd15f0d35ddc3c79df845e82ad96e0ad7b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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