Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7f0581c19fdda21885514f51da7dc5aaa2a4995e6e27454b79d61202a929ca78:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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