Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1c2eac0707ed2213f49a382c3e673bda1d790a607829e14151f9c36c7c29187c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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