Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f1887faedfafde8ef4d8f4b5b8e877c0f682f609a847765e2dd2ebcac6c3fb06:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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