Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1d395c216f6f8b522952f8b4094db85e48abcffb7d50d8bca4b2b493c40d84f9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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