Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5113b649278b79cb2aa305c93f614e1e156ff7b75b839597adab6051871e5b82:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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