Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a728587a6c1354c74e74a67e6280eef1b491c589430f69cfc99308c133934cc3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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