Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ddc7377376a96fcedf5f4e81b23bac6039e3e73cc0d8c8530ff466c0633ceeff:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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