Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 33208f3fc3576ef6782527c346ca4d73d522bea08b8de8b6101db64efe64aaf6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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