Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab5fc40354d3d053dceee61e8f6e3ff8ccf0be0e658ddbbf6506cc6173882a6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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