Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e50d98d9f8c756474929895e5c9fa9d727167f6f18990b51a34b186f3ef0e765:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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