Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 07009d49b46768fa1b63b6f06fee9725ed230042a7ddf09b63ea716c4834f6e6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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