Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e56c6ef487c5256774da3b6efc0a4de09bcb6c0b9a9b328cb925da7d28f35b41:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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