Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a80ab962a8d23fc22c666ce38e6f26cb8631e83550e63e38e5da9eef6338be7e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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