Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cfada7a3e8f79dae042aee5bb0d76b21510b199a4b05265d4a099605bf0f9d52:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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