Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f6aa506f8d18c403f6f291a85481bfbd0551754b7e65dec0fb4a4568cd427d9c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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