Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e48233b648379a3a32eee61fc4c893f9402a2b987cd3cb33579891acf14522ce:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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