Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5085dee59155d7e3b4b75c43e20ebd4b3eb914fff1a61ebc6c82ee2ca88d8a8c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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