Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e546971a8088f9bea30610e219e2cd3a2e7c8b0607c9e5e996b3213f78be3b4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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