Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ee81173d68e240074bc0153a1027aa307d63543e07ee325c93fc680dca5236a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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