Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0155f263b8cc5e5f69c3795e94e8aa445374043b7bf0fd7e89dcccf0b9048dda:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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