Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a072e4f4828ae10290d87caf145e9a62fad19ca5c9d3d3cac94e6d4d8b314ebd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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