Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> beb9c58a13c0120533ebdef81fb7fe481457c6c89cc6e4bad8ea873d0aaf0e15:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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