Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ae9f5585e6e5df1474c9de9b150c57795c968f7fc201caeecf79e9f86ee3b41a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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