Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 043707ef74f4f7e3083609b9fa3247fec1e2a38e1152c3a4d995a27e4040fb1b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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