Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 77d07851908d069e4770cbe961bed2e0babdd0e8b058f7983f1833021ee57773:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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