Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6090f37e67f3c113c91f892e26c40a97704e094ff337dab876363c8eda94613f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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