Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 198bb4d0ba83e8789eea8c9b8deff020ecf1d291ae6040497b3bfb0d75b29a76:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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