Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f50eb07c570a031e398daae6ce2ccf2eae9cf9b5c222157bdec26ecd8ea4cb44:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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