Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc4ceda0c5409a39d9706c034edfcdc676b304febee8849c258602e8e1f50fd2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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