Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab5b1cd75104f7b221fe6beb94de1458cfec7158ccd2b6cb08a218a58219f630:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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