SecurityException in Application cpp 193: Do not have root privileges. Executable not setuid root?
There are many reason available to cause this Internet Server Error when you running php as CGI.
[Tue Oct 08 20:33:41 2013] [error] [client ] SecurityException in Application.cpp:193: Do not have root privileges. Executable not set-uid root? [Tue Oct 08 20:33:41 2013] [error] [client ] Premature end of script headers: index.php [Tue Oct 08 20:33:41 2013] [error] [client ] File does not exist: /home/user/public_html/500.shtml
The error was because the suphp binary was missing its suid permissions. In order to fix this issue, check suphp binary permission and change it.
chmod +s /opt/suphp/sbin/suphp
Thats all