Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5fbda33475d3d25e43d9b5e01afc8812b98c0f761804231a882958662a60da38:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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