Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 76fd70e5e96d6cc6f21fda675f4e8c55f4dcd402b7c74e4caf48beacda3748ed:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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