Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 91c7e1fd6ac2873971c96810b33546e2e5be1d6cff87042f8f194f520ebe850d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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