Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0e916648928e3f4f4f4dc1d18b96bd2b6ead47b0da407c6e7b4037502a104a0a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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