Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> df8ca7f33c6ce6b9659ba485f8bc067683b86d5573c808231a03afb665042799:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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