Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 67df8353d2ba554110ed6d33741f85e63208e053665c603d9a8f7b73ae94c7c9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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