Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 00a4b6d310438a5372e49b983de07802946ca47fbb0fd22774155f394108054e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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