Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9df834e14c93609f57482979bed7c49d311cf9b81ab098befd95de67aa951163:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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