Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ff21938ddf1ee16c05cbd23e3accbdd3effc76c38eba184aef2b3c58e13de765:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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