Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8728dee46999f3de6b7bec44e9fffb8ed4c58b765ec48cf297a9c4a5ca19dfde:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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