Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 59610413cef0683c4c99c1b4ca89c94e467cac875b6533fbe77cfd217276fa73:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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