Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1102a66b0e5a5735795d52ea48d33dff7dfd2b953ea03682f0fbd07021ea3c68:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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