Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f12af43369cbad1ba777ef0b27180ce4b27b708153ef47536a46d8ddc0a5346e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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