Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> be1f7727cf84a36c16ee6b0d719ab78d349de0bc9cc42efed8316b724c4029cd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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