Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e5c53a4e1897cb89811071859980a6ad1732ee3b555eaa78c72cb56c3b525de1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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