Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cef54d7d9b5f68e54d5c042782b777ec086c5f481492a63c67cf9a7a39746f98:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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