Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9df1f733601aa4ebd180ce7c463a54ca4b67f397481599d3f6e3c82332491e68:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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