Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d0ccefc7f184a869409024aa5faaf308b4b350951e15ab4fd1646c2232ef6284:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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