Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6b3b10b9309b00dc917517c9aa367c5bc3d339fe8f306a2bd174f777fb7f2e27:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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