Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4f151e4f6db9d254253f389daaad12c04cea60c3426dcf3a0c53a545d185f4aa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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