Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d4a43d33a9a4b3bfb88c08e4a44609e73403b6eb405a79cced9fa522948133bd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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