Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e6206bfceedd0572c473d7fb59dafac6bf43f57cf4fe58aa953d571ac86212d6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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