Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b447fc8fb6f41d9f06e236839e4758309eabd7ec1a9a78df9750a5e550d170a4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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