Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 849e6350216909b8ec564c33a028149f5b55b1b9c72dfd2be60a19ba781c8755:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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