Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0421a5b24a5db7d2ff9f930f433ff72a6ef298ec54f2e4199ca47e0c5275529f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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