Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6eec0b3746f521807947f910a92c7ec1ef136b417b48ecf1f4457b1e4ddc3e1c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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