Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e0f343161de6206e106c087d416d4bfeb55de6738928e7317ae5c6d3c6b62c54:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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