Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 499273c7dd6813e94fe97668dcc0e7c15b9be54a75861142b3abf0e5edb228a4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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