Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 270ed9ad247c51ff9180f218933ee598660b6cdde6d58034c64a1cf64c2db84f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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