Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 55e2f9114686c979816759668a53f9226069e7aa4ab3d8d37bbc4da0cbc95dbb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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