Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9a055f8b5ab8034b0897fdd20e72018c1d4903b4c7b2a71f7a13259f58e9a414:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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