Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ecf62fb4693ab27518304054b6d2744ae631cea75b18ffa11ace34f2db3a7477:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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