Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e1f7de4fc1db35bdbb12482001ffbb57322345d96cf1b99e1cb55bb6e4844089:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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