Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c3954369e5e32fced03b17ef72f59331f6d33e8500b29f276a3669f011758a26:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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