Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 279e6432ebaf95f9f2b40e8e7f584a5db2078f0764a28764e303e55617b78130:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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