Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 400e1a608b8d208997c2ecf128b847c96d92462a995adf5b78a9a2eef18746c7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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