Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 55aa0da91a1c283cda3d7ea83ad957b8366cabf14ab495bc66c6236a0db35679:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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