Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 743f8812e741fe304077b6b896ae7e63a34b3747f362c566001ec228f830cc0c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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