Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c506b56f67ffa998cc39493a42c69f354e5696d94173135fac35a1f8d2b08c3b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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