Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8a96fea64f803af78942bf1b3367a63fb57014ef954605c65e0ef6885ad2cb85:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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