Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5f48d137312af01e56543a7d8fc5d5f59da814577850402d051fbbc7187f921b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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