Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3f60a214c374ed3c475d65baceac96ec6c88e9561843430568a870461d551526:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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