Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc0c54e6dbeb750d39c4409aa23f483825fc6ee3d9aab0ba10c1e15b7c3885ed:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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