Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e7b12de10dc3792f9061d35c85fd0847e562f46e22065d73da98a815c093bd1a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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