Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 02fbe7384e7a60b96d1a09cef427ab2d28bcfc0ec9f7720475c64ae2ff2a8ab8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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