Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7d8de6f94e710badebc4fb376929c0997d5f47802f0a35419ebf81650f350de:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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