Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d3899b33afc551ae91fa24d7567f4777746f3b596c0af1baa899627d87ad7b6c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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