Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d0ab112118fa31f89510ae82b6e9178e1a05bc51b70cd2f48828ee1f1d6168bd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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