Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 14a91ffdc96f0af1d7c3b82156172a83b33f5cbe5cbae0eef6472f81872078a2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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