Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9db3e124c45a19c500caf526f920e0125dbf59b14dc621029b782c1e887931a6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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