Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1b994415e5ed28923ef369f6a6ef4e8c09ed9a8180a13c471f8338e045ecd239:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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