Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 28f7658185c9f1c593269e28193c8283080411c73cdcedc0a0196da44b769f29:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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