Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c51ec0ff5b9fb059651b7b9fb54f43cf5446e18b3ee2bd91114b97fb88b81df6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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