Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6514a7e49a20f1852fdbbd1e82ffca8be4f80cb5668eb5972d210f53148b751f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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