Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fb03db8c8e64329cac16c0b61c79730e1fbfb353d248e049947873ac0b9b23e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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