Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f6c3b0cdceb48e16f002305e1b15cab0e54e42aef25ac18024ead04239a37c28:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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