Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4d1b7cfd2db1466e2547e07b335bab1f65e53a43be3942bbd66785f47c8894d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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