Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b431445d3dbe984e9702b08afe81743ac8f60d31a618a6e5a66affbb88f66ee6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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