Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 61a345d9f53e5872c921e67c65c16e3684bb46de76cfb96e79ab8874a2ca6054:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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