Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fb3738be2c096c441bc5ad0f01c38af9d3692405f7820ab8e74ab7fc1df728c4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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