Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 27333c8aced1e621e863e079703f7d05772e1f8c9e4a2e9445a43e21122e411e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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