Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5811a61b8963d2366e09120c39f88f7ff9e29049dfe5c8dbe88d11a4c0777018:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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