Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8c78243c28ee72ad4299f206be787316d155ce728d29ee5ea6495e230c8b4ad5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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