Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab01eda9645cac3ea80f7b66507805d9cc086bef8c798fcb0d95f51483b256da:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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