Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 23c91a36ff1d794cddf59bbac4cf8098697f8cc8aa09e1011430366bb1d2e845:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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