Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f0c58ef56255fb87a99e79b1961d253434f4e79f0bd7766dd6bc157283a2918c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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