Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8c8b7907c9f0df883266c5020ca7031da1792da9ed24e0259992746a3d5c1f64:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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