Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2e89e49b4c5057a0dc346b730e542959793bbf13c26168ab3c673b19adb5c41a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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