Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6d6edc8f237ffb96611ccafcc0d21e1f07b6295e1d6c43b97f870c974229c6a2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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