Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2dcb4b3d20aeb8ab6244c06eef5ce66d9086297e2b9eecd81b9a8c68ab049031:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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