Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 19c1a90442547a322a0c54478cfded7c77efd7dc89eb50860ed90d7605083984:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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