Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8f64fa0565ff76c694ac0c59b72229406482b23720b912c8508c8c74d57cb28a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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