Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c2513866c56cbf9f05680cea2398c4acc12e3409d288438b0d215f7a91f76f67:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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