Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd4e0f8e5013ddd3363d1244df7c84c7435c00f0ec4773987c171ccf5821edc5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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