Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5f8996b84c450b0cdb4a693d667243cda0730f414e0c8527e594f783fb5b5c08:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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