Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aedfa8a4521b7a5ac268ec10ec3a168886053cdcd5df81b583f1a5749cfdde74:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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