Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0e6edb718afde987f3caf65eaefa790f81f2df840bd6e27b255aaf7b85c25b78:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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