Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 97db8aec7b1fadaf6fd8b327095b5a2ce0a93ba394d18df7d1e0d4dab96d8323:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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