Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0ca65f6fe71b651ac3b6362e31b31b3e0f171008ac374b42dc73f2b0ad5fa301:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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