Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c53271f429f95f9f72d04f95ac826a089174b0211c7f7a4ded625648da7bc6f3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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