Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5a9f819946b7fc2d269f6600bfd3feb106ad16f67d3e4385492c724203aaec95:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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