Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 34c10c85151f65c3acdc25f21341b825c973e2ffe3872eb5b720fda39e1f28e1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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