Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 621170f82d91fcc403c554dea7e9ed66b9191c2220e77e7f8fb9bea7674a4c2d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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