Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8e4814644f95e1a69ca4f40ebe10a8e9d5fb15c2eb512143353abee442d1423d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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