Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 814c748f8a40014fbe7915cf12f80a987f457c7ea185af66bf589481d8f1d69d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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