Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1f1983fdd849719a7e4e5347b7b91469b6cef3d3be15e7e11c6c86f09ad0f1fb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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