Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9a1e6420413eb8fde90c2b01953c57512321b8249dbefd1a6c99e43748edaf14:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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