Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc42345efeca30ac8ff82c3d86fc11b33f6fcf5885fe3066185778634b753417:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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