Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7e66e5131e8be647f848a751f72675317c37ad6498781bfd89cc50b8bc03b7c8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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