Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f2216cd8357a124afe29f06cb2e6a92899b70427165e669112a21ef846984e7f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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