Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 60e1f7d78e85e8b8ed310ea693ab9e218145a29ffaef5113eaebec71e063a14f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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