Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5f465615b72dbd5ce44a890ef72f92c3bb24176ae5418259b64481cc6fe9d5f4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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