Warning: shell_exec() has been disabled for security reasons in

You would receive the above warning message while accessing Fantastico through cPanel.

Please check if the below options are selected in WHM (you need to access WHM as root)

Login to your WHM control panel as root scroll down to the PHP section and make sure the
IONCUBE PHP Loader option is selected.

Then log into your server as root using SSH and execute the following command:
#/scripts/makecpphp

Above command will check the php config files and will make the changes if required..