Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9138374ae83634c02665646d9cf322dcf9d4f9d7fa01b0b89d049e524646bbf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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