Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4561b7019b52c056b48404b0009aad355969b1bcb45f3b8aec6fd97559f47c4b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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