Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8225c36966f76341b920e4594a5586f8d2f7eded5304c06530325b3802a9a029:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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