Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b98af91edb7448f2f81fe61bb40a6d4cbc7bf8464579f6c204b4b9253a2b7f7c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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