Problem with assets dir

redux_sample.php

<?php

if( !class_exists('Redux') ) {
    return;
}

$opt_name = 'wpss_option';

$theme = wp_get_theme();

$args = array(
    'display_name'       => $theme->get('Name'),
    'display_version'    => $theme->get('Version'),
    'menu_icon'          => WPSS_IMAGES_DIR . 'default-cpt-icon.png',
    'menu_type'          => 'menu',
    'menu_title'         => esc_html__('Site Options', 'wpss'),
    //'page_parent'     => 'themes.php',
    'page_priority'      => 9,
    'page_permissions'   => 'manage_options',
    'page_slug'          => '_wpss_options_page',
    'page_title'         => __('Theme Options Page', 'wpss'),
    'show_import_export' => true,
    'customizer'         => true,
    'dev_mode'           => false,
    'update_notice'      => false
);

$args['share_icons'][] = array(
    'url'   => 'https://www.instagram.com/agenciamoustache/',
    'title' => 'Follow us on Instagram',
    'icon'  => 'el el-instagram'
);
$args['share_icons'][] = array(
    'url'   => 'https://www.facebook.com/agmoustache/',
    'title' => 'Follow us on Facebook',
    'icon'  => 'el el-facebook'
);
$args['share_icons'][] = array(
    'url'   => 'https://pt.linkedin.com/company/agenciamoustache',
    'title' => 'Follow us on Linkedin',
    'icon'  => 'el el-linkedin'
);
$args['share_icons'][] = array(
    'url'   => 'https://www.youtube.com/channel/UCVj7LW6-fOBAqgCuxaypZ8g',
    'title' => 'Follow us on YouTube',
    'icon'  => 'el el-youtube'
);

Redux::set_args($opt_name, $args);

/*** Talent Integration */
Redux::set_section($opt_name, array(
    'title'  => esc_html__('Talent Integration', 'wpss'),
    'id'     => 'wpss_talent_integration',
    'desc'   => esc_html__('Input your Talent site url and API Key.', 'wpss'),
    'icon'   => 'el el-glasses',
    'fields' => array(
        array(
            'id'           => 'wpss_talent_site_url',
            'type'         => 'text',
            'title'        => __('Site URL', 'wpss'),
            'desc'         => __('Your Talent site URL', 'wpss'),
            'validate'     => array(
                'url'
            ),
            'placeholder'  => __('https://mysite.talentlms.com/', 'wpss'),
            'autocomplete' => 'off'
        ),
        array(
            'id'           => 'wpss_talent_api_key',
            'type'         => 'text',
            'title'        => __('API Key', 'wpss'),
            'desc'         => __('Your Talent API Key', 'wpss'),
            'autocomplete' => 'off'
        ),
    )
));

/*** Header options */
Redux::set_section($opt_name, array(
    'title'  => esc_html__('Social Links', 'wpss'),
    'id'     => 'wpss_social_links',
    'desc'   => esc_html__('Configure your social links.', 'wpss'),
    'icon'   => 'el el-share',
    'fields' => array(
        array(
            'id'       => 'wpss_social_ig',
            'type'     => 'text',
            'title'    => esc_html__('Instagram', 'wpss'),
            'subtitle' => esc_html__('Insert your Instagram link.', 'wpss'),
            'validate' => 'url'
        ),
        array(
            'id'       => 'wpss_social_li',
            'type'     => 'text',
            'title'    => esc_html__('Linkedin', 'wpss'),
            'subtitle' => esc_html__('Insert your Linkedin link.', 'wpss'),
            'validate' => 'url'
        ),
        array(
            'id'       => 'wpss_social_fb',
            'type'     => 'text',
            'title'    => esc_html__('Facebook', 'wpss'),
            'subtitle' => esc_html__('Insert your facebook link.', 'wpss'),
            'validate' => 'url'
        ),
        array(
            'id'       => 'wpss_social_tt',
            'type'     => 'text',
            'title'    => esc_html__('Twitter', 'wpss'),
            'subtitle' => esc_html__('Insert your twitter link.', 'wpss'),
            'validate' => 'url'
        ),
        array(
            'id'       => 'wpss_social_yt',
            'type'     => 'text',
            'title'    => esc_html__('YouTube', 'wpss'),
            'subtitle' => esc_html__('Insert your Youtube link.', 'wpss'),
            'validate' => 'url'
        )
    )
));

/*** Custom Javascript */
Redux::set_section($opt_name, array(
    'title'  => esc_html__('Custom Scripts', 'wpss'),
    'id'     => 'custom_scripts',
    'desc'   => esc_html__('Insert your custom scripts here.', 'wpss'),
    'icon'   => 'el el-quote-alt',
    'fields' => array(
        array(
            'id'       => 'wpss_header_script',
            'type'     => 'ace_editor',
            'title'    => __('Header Javascript Code', 'wpss'),
            'subtitle' => __('Paste your javascript code here.', 'wpss'),
            'mode'     => 'javascript',
            'theme'    => 'monokai',
            'desc'     => esc_html__('Your script will be inserted immediately before the </head> tag', 'wpss'),
            'options'  => array(
                'minLines' => 30,
            ),
            'default'  => "//$('#your-script-here');"
        ),
        array(
            'id'       => 'wpss_footer_script',
            'type'     => 'ace_editor',
            'title'    => __('Footer Javascript Code', 'wpss'),
            'subtitle' => __('Paste your javascript code here.', 'wpss'),
            'mode'     => 'javascript',
            'theme'    => 'monokai',
            'desc'     => esc_html__('Your script will be inserted immediately before the </body> tag', 'wpss'),
            'options'  => array(
                'minLines' => 30,
            ),
            'default'  => "//$('#your-script-here');"
        )
    )
));

/*** Custom CSS */
Redux::set_section($opt_name, array(
    'title'  => esc_html__('Custom CSS', 'wpss'),
    'id'     => 'custom_css',
    'desc'   => esc_html__('Insert your custom CSS here.', 'wpss'),
    'icon'   => 'el el-css',
    'fields' => array(
        array(
            'id'       => 'wpss_custom_css',
            'type'     => 'ace_editor',
            'title'    => __('CSS Code', 'wpss'),
            'subtitle' => __('Paste your CSS code here.', 'wpss'),
            'mode'     => 'css',
            'theme'    => 'monokai',
            'desc'     => esc_html__('Your css will be inserted immediately before the </head> tag', 'wpss'),
            'options'  => array(
                'minLines' => 30,
            ),
            'default'  => "/* Custom CSS Code */"
        )
    )
));

/*** Site Maintenance */
Redux::set_section($opt_name, array(
    'title'  => esc_html__('Maintenance Mode', 'wpss'),
    'id'     => 'maintenance_mode',
    'desc'   => esc_html__('Enable site maintenance mode.', 'wpss'),
    'icon'   => 'el el-lock',
    'fields' => array(
        array(
            'id'       => 'wpss_maintenance',
            'type'     => 'switch',
            'title'    => __('Enable', 'wpss'),
            'subtitle' => __('Configure site maintenance mode.', 'wpss'),
            'desc'     => esc_html__('Enable/Disable Maintenance Mode', 'wpss'),
            'on'       => 'Enable',
            'off'      => 'Disable',
            'default'  => false
        ),
        array(
            'id'           => 'wpss_maintenance_title',
            'type'         => 'text',
            'title'        => __('Site Title', 'wpss'),
            'subtitle'     => __('Define site title', 'wpss'),
            'desc'         => __('Site title when maintenance mode is enabled', 'wpss'),
            'default'      => __('Maintenance mode enabled', 'wpss'),
            'required'     => array(
                array(
                    'wpss_maintenance',
                    '=',
                    true
                )
            ),
            'autocomplete' => 'off'
        ),
        array(
            'id'           => 'wpss_maintenance_description',
            'type'         => 'editor',
            'title'        => __('Site Description', 'wpss'),
            'subtitle'     => __('Type maintenance description', 'wpss'),
            'desc'         => __('Add a short description to maintenance mode.', 'wpss'),
            'default'      => __('Our site is undergoing scheduled maintenance', 'wpss'),
            'required'     => array(
                array(
                    'wpss_maintenance',
                    '=',
                    true
                )
            ),
            'autocomplete' => 'off'
        ),
        array(
            'id'       => 'wpss_maintenance_background',
            'type'     => 'background',
            'title'    => __('Background Style', 'wpss'),
            'subtitle' => __('Set maintenance background.', 'wpss'),
            'desc'     => __('Pick a color or send a background image to maintenance mode.', 'wpss'),
            'default'  => array(
                'background-color'      => '#FAFAFA',
                'background-repeat'     => 'no-repeat',
                'background-attachment' => 'fixed',
                'background-position'   => 'center top',
                'background-size'       => 'cover'
            ),
            'required' => array(
                array(
                    'wpss_maintenance',
                    '=',
                    true
                )
            ),
        ),
        array(
            'id'       => 'wpss_maintenance_login',
            'type'     => 'switch',
            'title'    => __('Login Box', 'wpss'),
            'subtitle' => __('Enable login box.', 'wpss'),
            'desc'     => esc_html__('Enable/Disable user login box', 'wpss'),
            'on'       => 'Enable',
            'off'      => 'Disable',
            'default'  => false,
            'required' => array(
                array(
                    'wpss_maintenance',
                    '=',
                    true
                )
            ),
        ),
        array(
            'id'          => 'wpss_maintenance_login_box_color',
            'type'        => 'color_gradient',
            'title'       => __('Login box background color', 'wpss'),
            'validate'    => array( 'color' ),
            'default'     => array(
                'from' => '#FAFAFA',
                'to'   => '#EBEBEB',
            ),
            'transparent' => false,
            'required'    => array(
                array(
                    'wpss_maintenance_login',
                    '=',
                    true
                )
            ),
        ),
        array(
            'id'       => 'wpss_maintenance_login_logo',
            'type'     => 'media',
            'url'      => true,
            'title'    => __('Select the login site logo', 'wpss'),
            'default'  => array(
                'url' => WPSS_IMAGES_DIR . 'joao-cordeiro-logo-black.png'
            ),
            'required' => array(
                array(
                    'wpss_maintenance_login',
                    '=',
                    true
                )
            ),
        )
    )
));