Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2caaf8b8070e35dfe70a573b94d5d027e5f9fde9f05c5f60d04546a43529b397:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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