Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c53baef0f20f06493dc95787940a35a2a37e4155c2be4f8b73af7c5cfa240a6a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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