Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 52692da228a933310c615665727955e6a91ece78324da7b4cbcc9894939f112b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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