Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 286d949fc84da88ac10bb2f59473cba4910d32d53d6317e5deab0cdcab6f0808:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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