Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2c7ff6aecc704c92a891d285bd939d3654ca8802a81a248ee35801bddb747ac7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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