Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f76eb14b237d2693fdf5c0c7df70f5d504aff4c248958a300808b20fd46beac4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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