Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bedac66f7341d97065bf6009b62fc60b352accf21a9d32de2ca4fdaa689ef17b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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