Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2d9c9f4e8b0742ab4ca13e5df39609f6286fad8b646259b13cea8c054ae9f54b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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