Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bed2ad6c4d032c461517c428a06db4ea68feb2dbfafa21e79ca815051c568874:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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