Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ae25e750d5e41c9275d13a84c951072f232544e25248753b99a29e9ae510b969:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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