Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 54c2951896d0c46f017b638b89e8a4c0e06b8455dacb7df79863ebdaaa5ee58c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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