Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b8f5b9573d6345c66f606770b4cefed302e14376637c6e5b2eabe2373f7f8ea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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