Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f1994a35dee2191444f8bf1527974028c21edd77c52085e5d7dfbd73905ce4bd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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