Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9707a8e8f19eb1107444266c7edab8bb5edd50ca6cba005173b5a69a3c04f155:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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