Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e83bd18df89579ad99a80d20e9f9d5999422ad7b2612989f06fc90c360a6bd50:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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