Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8e356291a2fc5ed75054358ab87c61462f46f72306e9ac4245d0b7eca67c7acd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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