Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df1661aa88236ed864402667413cc43f6e0df5c03db345fdb09bd6a263497e05:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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