Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bdefb0973196f8bb4cb3956b32cd13a99a4881aaf3d9c20e2f590d09c5b721a7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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