Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc8a8cfb8d86b55494b8e63ec827125a45c28bc63b5fe8779733d1df644ca031:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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