Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 842d6986a8154ae4fb08df43cf391413d5e5fa8064f054169f42a65053b394a5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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