Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 393de544255e12b9d79d4ff78625a9ec586f90f9771f2d7ff0c19b65869d7da8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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