Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1de97b6e5cfdd9c7ec6f70f66644ed4c9ef475c6bafa92a3c075e9bce14563f3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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