Contact your host and/or check your error log, you might have to turn on more error reporting depending on what level it is set at, it could be any number of things including memory allocation.
To have multiple menus you can use register_nav_menus
Reference:http://codex.wordpress.org/Function_Reference/register_nav_menus
To add them to your template you use wp_nav_menu
Reference:http://codex.wordpress.org/Function_Reference/wp_nav_menu
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