Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3d394e6d271ccc23aeebeaf3138f3a5cab802ebf1d11e52d5530ae3785f4d8a1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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