Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d75380812aa6e4a69f803916c2ce538190f6f76dc02e8df84bd7c68b327f5dd1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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