Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 108b56b43e690e9edd9c4bd901df4b978e654da7f8879c9b13ec7a9567333ee1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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