Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 428fae0e5e624ffbaffd38bac666ed1f467ec6b5c602e4510e51136cef824370:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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