Error in show home php

<?php
/**
 * Functions file for the Lyle Gomes child them */

 function lylegomes_setup() {

 // This theme uses wp_nav_menu() in one location.
	register_nav_menu( 'secondary', __( 'Footer Menu', 'twentytwelve' ) );
	register_nav_menu( 'mobile', __( 'Header Menu', 'twentytwelve' ) );
	register_nav_menu( 'additional-portfolios', __( 'Header Menu', 'twentytwelve' ) );
 }



 add_action( 'after_setup_theme', 'lylegomes_setup', 11 );

 // Add the site description for the home/front page.
	$site_description = get_bloginfo( 'description', 'display' );
	if ( $site_description && ( is_home( 'Lyle Gomes' ) || is_front_page() ) )
		$title = "$title $sep $site_description";

function twentytwelve_child_page_menu_args( $args ) {
	$args['depth'] = 1;
	return $args;
}
add_filter( 'wp_page_menu_args', 'twentytwelve_child_page_menu_args', 20 );


// Adds JavaScript for dequeuing the twenty twelve script and adding the custom one, handling the mobile navigation menu hide-and-show behavior. Note the js file name change and that get template directory was changed to get stylesheet directory



function lylegomes_scripts() {

wp_dequeue_script( 'twentytwelve-navigation' );

wp_enqueue_script( 'primary-mobile', get_stylesheet_directory_uri() . '/js/nav.js', array(), '1.0', true );

}


add_action( 'wp_enqueue_scripts', 'lylegomes_scripts' );


/**
 * Makes our wp_nav_menu() fallback -- wp_page_menu() -- show a home link.
 *
 * @since Twenty Twelve 1.0
 */
function twentytwelve_page_menu_args( $args ) {
	if ( ! isset( $args['show_home'] ) )
		$args['show_home'] = 'Lyle Gomes';
	return $args;
}
add_filter( 'wp_page_menu_args', 'twentytwelve_page_menu_args' );


	?>