Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 080c27840f80187622624d9625cc5853b1d765f4d0e70e614d70db9a5e71fa0c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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