Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 997cb87d24259e82345dfa28ea4da31fb3c1d1e6af9c3435a75431a15375388a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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