Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a2dd3c43077fbca3d4ddecf5c3fc66825eded79789682e3fc0d4bb8c7d3a9ffb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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