i found an error when installing Genesis Layout Extras

when I’m installing this plugin i found an error which is listed below

Warning: Cannot modify header information - headers already sent by (output started at /home/content/p3pnexwpnas04_data01/20/2462320/html/wp-content/themes/magazine-pro/functions.php:184) in /home/content/p3pnexwpnas04_data01/20/2462320/html/wp-includes/pluggable.php on line 1196

Warning: Cannot modify header information - headers already sent by (output started at /home/content/p3pnexwpnas04_data01/20/2462320/html/wp-content/themes/magazine-pro/functions.php:184) in /home/content/p3pnexwpnas04_data01/20/2462320/html/wp-includes/pluggable.php on line 1196

i use magazine pro child theme with genesis framework.
and my theme function is

<?php
//* Start the engine
include_once( get_template_directory() . '/lib/init.php' );

//* Setup Theme
include_once( get_stylesheet_directory() . '/lib/theme-defaults.php' );

//* Set Localization (do not remove)
load_child_theme_textdomain( 'magazine', apply_filters( 'child_theme_textdomain', get_stylesheet_directory() . '/languages', 'magazine' ) );

//* Child theme (do not remove)
define( 'CHILD_THEME_NAME', __( 'Magazine Pro Theme', 'magazine' ) );
define( 'CHILD_THEME_URL', 'http://my.studiopress.com/themes/magazine/' );
define( 'CHILD_THEME_VERSION', '3.1' );

//* Enqueue Google Fonts and JS script
add_action( 'wp_enqueue_scripts', 'magazine_enqueue_scripts' );
function magazine_enqueue_scripts() {

	wp_enqueue_script( 'magazine-entry-date', get_bloginfo( 'stylesheet_directory' ) . '/js/entry-date.js', array( 'jquery' ), '1.0.0' );

	wp_enqueue_script( 'magazine-responsive-menu', get_bloginfo( 'stylesheet_directory' ) . '/js/responsive-menu.js', array( 'jquery' ), '1.0.0' );

	wp_enqueue_style( 'dashicons' );

	wp_enqueue_style( 'google-fonts', '//fonts.googleapis.com/css?family=Roboto:300,400|Raleway:400,500,900', array(), CHILD_THEME_VERSION );

}

//* Add HTML5 markup structure
add_theme_support( 'html5', array( 'search-form', 'comment-form', 'comment-list', 'gallery', 'caption' ) );

//* Add viewport meta tag for mobile browsers
add_theme_support( 'genesis-responsive-viewport' );

//* Add new image sizes
add_image_size( 'home-middle', 360, 200, true );
add_image_size( 'home-top', 750, 420, true );
add_image_size( 'sidebar-thumbnail', 100, 100, true );

//* Add support for additional color styles
add_theme_support( 'genesis-style-selector', array(
	'magazine-pro-blue'   => __( 'Magazine Pro Blue', 'magazine' ),
	'magazine-pro-green'  => __( 'Magazine Pro Green', 'magazine' ),
	'magazine-pro-orange' => __( 'Magazine Pro Orange', 'magazine' ),
) );

//* Add support for custom header
add_theme_support( 'custom-header', array(
	'default-text-color'     => '000000',
	'header-selector'        => '.site-title a',
	'header-text'            => false,
	'height'                 => 90,
	'width'                  => 380,
) );

//* Reposition the primary navigation menu
remove_action( 'genesis_after_header', 'genesis_do_nav' );
add_action( 'genesis_before_header', 'genesis_do_nav' );

//* Add primary-nav class if primary navigation is used
add_filter( 'body_class', 'backcountry_no_nav_class' );
function backcountry_no_nav_class( $classes ) {

	$menu_locations = get_theme_mod( 'nav_menu_locations' );

	if ( ! empty( $menu_locations['primary'] ) ) {
		$classes[] = 'primary-nav';
	}
	return $classes;
}

//* Customize search form input box text
add_filter( 'genesis_search_text', 'magazine_search_text' );
function magazine_search_text( $text ) {

	return esc_attr( __( 'Search the site ...', 'magazine' ) );

}

//* Modify the size of the Gravatar in the author box
add_filter( 'genesis_author_box_gravatar_size', 'magazine_author_box_gravatar' );
function magazine_author_box_gravatar( $size ) {

	return 140;

}

//* Modify the size of the Gravatar in the entry comments
add_filter( 'genesis_comment_list_args', 'magazine_comments_gravatar' );
function magazine_comments_gravatar( $args ) {

	$args['avatar_size'] = 100;
	return $args;

}

//* Remove entry meta in entry footer
add_action( 'genesis_before_entry', 'magazine_remove_entry_meta' );
function magazine_remove_entry_meta() {

	//* Remove if not single post
	if ( ! is_single() ) {
		remove_action( 'genesis_entry_footer', 'genesis_entry_footer_markup_open', 5 );
		remove_action( 'genesis_entry_footer', 'genesis_post_meta' );
		remove_action( 'genesis_entry_footer', 'genesis_entry_footer_markup_close', 15 );
	}

}

//* Remove comment form allowed tags
add_filter( 'comment_form_defaults', 'magazine_remove_comment_form_allowed_tags' );
function magazine_remove_comment_form_allowed_tags( $defaults ) {

	$defaults['comment_notes_after'] = '';
	return $defaults;

}

//* Add support for 3-column footer widgets
add_theme_support( 'genesis-footer-widgets', 3 );

//* Add support for after entry widget
add_theme_support( 'genesis-after-entry-widget-area' );

//* Relocate after entry widget
remove_action( 'genesis_after_entry', 'genesis_after_entry_widget_area' );
add_action( 'genesis_entry_footer', 'genesis_after_entry_widget_area' );

//* Register widget areas
genesis_register_sidebar( array(
	'id'          => 'home-top',
	'name'        => __( 'Home - Top', 'magazine' ),
	'description' => __( 'This is the top section of the homepage.', 'magazine' ),
) );
genesis_register_sidebar( array(
	'id'          => 'home-middle',
	'name'        => __( 'Home - Middle', 'magazine' ),
	'description' => __( 'This is the middle section of the homepage.', 'magazine' ),
) );
genesis_register_sidebar( array(
	'id'          => 'home-bottom',
	'name'        => __( 'Home - Bottom', 'magazine' ),
	'description' => __( 'This is the bottom section of the homepage.', 'magazine' ),
) );

//* Remove Query String from Static Resources in WordPress

function _remove_script_version( $src ){
$parts = explode( '?', $src );
return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );

//* show last updated date to the post info in genesis 2.0 HTML5 theme
add_filter( 'genesis_post_info', 'gt_post_info_filter' );
function gt_post_info_filter($post_info) {
 if (get_the_modified_time() != get_the_time()) {
$post_info = $post_info . '<br/>Last updated on: ' . the_modified_date('F j, Y', '', '', false);
}
return $post_info;
}

//* super easy way to move javascript to footer
remove_action('wp_head', 'wp_print_scripts');
remove_action('wp_head', 'wp_print_head_scripts', 9);
remove_action('wp_head', 'wp_enqueue_scripts', 1);
add_action('wp_footer', 'wp_print_scripts', 5);
add_action('wp_footer', 'wp_enqueue_scripts', 5);
add_action('wp_footer', 'wp_print_head_scripts', 5);

function defer_parsing_of_js ( $url ) {
if ( FALSE === strpos( $url, '.js' ) ) return $url;
if ( strpos( $url, 'jquery.js' ) ) return $url;
return "$url' defer ";
}
add_filter( 'clean_url', 'defer_parsing_of_js', 11, 1 );

?>

my blog url is dignol.org
plz solve my problem ASAP!

https://wordpress.org/plugins/genesis-layout-extras/