Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 78df18d46cdb96a3534f1fe7cc7cac7655917a997f2f3629a7df6dae526a1399:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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