Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b4fe6df8c2f3a64e8ad00fca0e424bbb194a69889eb3037195b6c29016d0adb9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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