Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f480dca9c73ca543941e89695721ac82623f21bc90dcc7c84b7b40ebb1b2e81d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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