Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d6f48258b7d2e9084821da5967701d703d2eccaca8e42ee6075edd98a3b6366f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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