get_template_part(); doesn't seem to work when used online

Here what I use to initiate the theme options page:

function setup_theme_admin_menus() {
    add_theme_page( "Theme Options", "Theme Options", "read", "th_op", "th_op" );
    function th_op() {
        get_template_part("content", "options");
    }
}
add_action("admin_menu", "setup_theme_admin_menus");

When I was building it offline at my localhost it worked, but when I relocated it online it stopped rendering theme options page for some reason.

Please help!