Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5af286a188c727c60e319697c0e8e4b38a0b8af79fa342508a5eaf0a34cb1a27:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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