Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3a3ebb88ace8b782e760e33943975764d958167b1ce33496d5026b403e9aaa8c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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