Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bac359f8c3d34e4f87b3c4636ada9b357261063c1890a9ba9c49dc3d0c6da6e6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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