Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ac1d7297a935251c35deb054f8100ef5a0455bc13482485c89497a8378831dd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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