Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 594854e2bcb77aee54f6daf0534ae3ff6392f8ce39c48e057923f8adb0bee401:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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