extensions.php

<?php
if ( !function_exists( "redux_add_metaboxes" ) ):
    function redux_add_metaboxes($metaboxes) {

        $boxSections = array();

        $boxSections[] = array(
            'title'     => __('Colors', 'redux-framework-demo'),
            'icon'      => 'el-icon-home',
            'fields'    => array(
                array(
                    'id'        => 'hero_color_info',
                    'type'      => 'info',
                    'title'     => __('No Color Options', 'redux-framework-demo'),
                    'subtitle'  => __('Because you have selected Revolution Slider as the content of this page, there is no need for a color items.', 'redux-framework-demo'),
                    'notice'    => true,
                    'style'     => 'info',
                    'required' => array(
                        array( 'section_type', '=', 'revslider' ),
                    ),
                ),
                array(
                    'id'        => 'hero_icon_color',
                    'type'      => 'color',
                    'transparent' => false,
                    'default'   => '#ffffff',
                    //'required' => array('hero_elements', '=', 'icon'),
                    'title'     => __('Icon Color', 'redux-framework-demo'),
                    //'subtitle'  => __('Optional: Set a custom color for the title text.', 'redux-framework-demo'),
                    'required' => array(
                        array( 'hero_elements', '=', 'icon' ),
                    ),
                ),
                array(
                    'id'        => 'hero_icon_background_border_color',
                    'type'      => 'color',
                    'default'   => '#ffffff',
                    'transparent' => false,
                    'title'     => __('Icon Background & Border Color', 'redux-framework-demo'),
                    //'subtitle'  => __('Optional: Set a custom color for the title text.', 'redux-framework-demo'),
                    'required' => array(
                        array( 'section_type', 'not', 'revslider' ),
                        array( 'section_type', 'not', 'custom' ),
                    ),
                ),

                array(
                    'id'        => 'hero_title_color',
                    'type'      => 'color',
                    'transparent' => false,
                    'title'     => __('Title Color', 'redux-framework-demo'),
                    'subtitle'  => __('Optional: Set a custom color for the title text.', 'redux-framework-demo'),
                    'required' => array(
                        array( 'section_type', 'not', 'revslider' ),
                        array( 'section_type', 'not', 'custom' ),
                    ),
                ),
                array(
                    'id'        => 'hero_subtitle_color',
                    'type'      => 'color',
                    'transparent' => false,
                    'title'     => __('Subtitle Color', 'redux-framework-demo'),
                    'subtitle'  => __('Optional: Set a custom color for the title text.', 'redux-framework-demo'),
                    'required'  => array(
                        array( 'section_type', 'not', 'revslider' ),
                        array( 'section_type', 'not', 'custom' ),
                    ),
                    'output' => '.hero-subtitle',
                ),


            ),
        );

        $metaboxes[] = array(
            'id' => 'page-type',
            'title' => __('Section Settings', 'redux-framework-demo'),
            'post_types' => array('page', 'post'),
            //'page_template' => array('page-test.php'),
            //'post_format' => array('image'),
            'position' => 'normal', // normal, advanced, side
            'priority' => 'high', // high, core, default, low
            'sections' => $boxSections
        );


    // Kind of overkill, but ahh well.  ;)
    //$metaboxes = apply_filters( 'your_custom_redux_metabox_filter_here', $metaboxes );

    return $metaboxes;
  }
  add_action('redux/metaboxes/redux_demo/boxes', 'redux_add_metaboxes');
endif;


require_once(dirname(__FILE__).'/loader.php');

Its not working!!