Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4db9afef39bbeed5e542f4d572747edf6f00f6a5117cdd833c0d967dc89f10e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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