Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3c95f4882d508b77d70729b65bd9104a05cfbd32112f5d3e0d7623a9e08302fc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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