Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e3746560b304b69d42cb843a12456b0ce595556a85af7f36ea36f553ef283b77:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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