Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eb43f2bf5e509996d9fa59366fc3f24d5f2ffe1cf1653dfe6dc43cb01d3712f3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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