Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5ef95f44d523bddaa8196754aae6d2b05f9b25aee5d12d004417c437a82660e6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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