Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 256c756e04dd3dca3bb8d9fc5d5c58046b605c30786e456d6b1f51f0d753c7ca:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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