Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c75726a8741faae04d5abaf4f9ed3860596a048a03dc9dcd92b161c03fc5c0da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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