Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a25bf3b0932572d16c85402bd07927cc2a43cf9bded9eb05f7df32e29d57100a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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