Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 929461b73ec4fcef21e47fe6194d27717c769219a43f6a1e5bcdcfa38505b7d4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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