Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 51231f084fc4e8518b1a351250f0841a121e9f580494432fd3acf11b6014ce4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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