Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 13681f4f036b1ade756b297bcf911c4c489b89a691f1ed3a9f4328e27562b0d6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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