Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a59bfc16cac70cfc9a11b7ca2f15abe4175d99527b6927e280c3dd065b46cde6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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