Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3cc726b0d098f82884b6fb20d977573f3bdb11910849d265e01290b92ce35b41:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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