Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c1e57c5a491f7e3ac1d557a7dfb822cb1578bedb23d697529f528a9857a28da2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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