Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e9a08b9fd13fed39b1d056f47b1678b82cb8bf8c668753a7693b724e53513871:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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