Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> da5293f7d1c12bd13817b6024cf66e5a9d74f7ef644074767cc9328353a3e772:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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