Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 45004c0658255ab6cbdc795d6fb743c920dbed68960b6a472e8fc661cd6b9fb4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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