If you are a publisher or simply loves to blog using different hosting sites and if you happen to accidentally messed up with some urls definitely you will fail to access your cPanel.Aside from failure to access the cPanel your ongoing blog or site you are creating will not be accessible.
Helping out a friend who is using 000webhost.com to create his website (free hosting) just accidentally overwrite the default given urls.
Here's the quick fix in case you encounter the same error and need not panic as long as you haven't deleted the database from your free web hosting site.