Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7c21e90d8ffa85daf97582f52a46153067f7fa618f240e20e889e711bd0a0f85:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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