Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c239e5485afc43ff56a48a1bf648678066269269e3ca68aa09efd363aa8b5fb7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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