Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 716450ba9d030cef65dd47ae2b55d31bf2d4b2aee260e02b13c01c2ac717abfa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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