Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c48ad69a29ea9f84c5d0dda0f876935af33c7d79f01c2aabfddab88294be9cef:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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