Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b6fe6ed58eb74bc57d7a059b6a4c2fa31510af0ebb76b13d5e27e9dfad82af66:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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