Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> da535bfb5fe1bf5a99027af7c6f96dbe50fa8dd28d10ca30e477858d6e585b02:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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