Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 06cfb9eb78473a9e6437061e267cc99d081f65946f01b6fc2a2dece3af44bd8a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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