Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 09fa11a5d93f5e38a1817ab4f55f37b68dc1d38d174d3754faa6b24ee35a6aef:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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