Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c68e16eceaad9d2bc04d34f21acb69b5e404163dfd56a399f20c8fd2e194ab4d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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