Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 98cf5459b968b5faf74f8aa9bf06cb4bd1ec750ed8efc664328dc728e4fcfde1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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