Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0ff823f58ae60cf9919d9a05fdaabf055192af63d2a8d4579928bbb59871e100:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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