Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1daa6c2f1a3b04642021a37b3f6c71133481bd67463de2247d5204fe3042c002:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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