Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 911e7a6762c33764098a85ab690f882f01c9a3aa57573a98589c0f306fd29c03:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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