Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1244f2b6be3e85e1b3538c8cf2603dc81786d0691bb17af5d12e94142bb8f685:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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