Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2bf36e407884add377f54ec134e32762050f6573eafcb9c2b7cc687079ac0b00:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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