Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2771e768ba052f904a27b9b6f478bf7c5f886dfc6ccbb531cf89f002a4bbe710:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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