Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 848a522c75de5da1d725a173f837d9ff12c8d6b7dec1ff3777abb692cb670c98:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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