Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 892c56cfd0d4194fee6e72e10335c0300033e6b989166fd17f169ea1b5e4ca78:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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