Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3083df8ca4d4e4c10135b4000dc4f5c75b863f65da754d6d8e6ecf252d3b5f7a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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