Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a13b78263c77a5c8a63f4dcb7ec2e22e3ee170530191998d781e001c46c57761:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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