Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f479c1b394a2d19df9cfe9f9a90bbacf46babc76b7052d90c35148503d1a3714:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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