Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2c32fb411b6faa43792a69e82853b4a72a84c28d7a088b5476eff33128d614d7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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