Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ceaf036fc033e535c42811b2c6a229f82d63d70d2454dd2ce19c2a56f35d7461:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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