Php fatal error- how to include class in index.php : I am having problem with my site.

PHP Fatal error:  Class 'innovation_ruby_util' not found in D:\inetpub\vhosts\blacklisthackers.com\httpdocs\wp-content\themes\innovation\index.php on line 7

Please help me adding classes in this code below

 1. <?php
/**
 * Innovation created by ThemeRuby
 * This file display home layout
 */
//get home options
$ruby_options['page_layout']      = innovation_ruby_util::get_theme_option( 'home_layout' );
$ruby_options['sidebar_name']     = innovation_ruby_util::get_theme_option( 'home_sidebar' );
$ruby_options['sidebar_position'] = innovation_ruby_util::get_theme_option( 'home_sidebar_position' );

$ruby_options['big_first'] = innovation_ruby_util::get_theme_option( 'big_post_first' );

if ( 'default' == $ruby_options['sidebar_position'] ) {
	$ruby_options['sidebar_position'] = innovation_ruby_util::get_theme_option( 'site_sidebar_position' );
}

//render featured area
get_template_part( 'templates/section', 'featured' );

//render home columns
get_template_part('templates/section','columns');

//render layout
innovation_ruby_blog_layout::render( $ruby_options );




