Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5c15a2cc3c1e138cee7c8902155487c7fcfc7faba27b7477c5a796d3bf78d5fd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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