Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5c84c01c839b506efcf90809f185d21b4cf537acfcbc6d8df44c742edd63ce09:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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