Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e2ef635fae45da0b44e0a730a88c9faeb0f422a9512a559a3b400055e488b85b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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