Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> affbe3c4fdad65831f693367fde1d6fdb4f4bafccfa8b940666329ab01d6c651:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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