Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8b3aff1e77cef097938db183fbe0730a0e7ad3a524a7a62b5943e2ea6d029086:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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