Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6dcbae742825a5e1f4e887f75741afb073c9f66ff39c9f7a4aaa1e70138683bb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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