Page not found – Hello World !

Current File : /home/kelaby89/teamhachem.com/wp-content/themes/artkombat/header.php

<?php
/**
 * The Header for our theme
 *
 * Displays all of the <head>
 */
?><!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
	<meta charset="<?php bloginfo( 'charset' ); ?>">
	<meta name="viewport" content="width=device-width">
	<meta name="format-detection" content="telephone=no">
	<link rel="profile" href="http://gmpg.org/xfn/11">
	<link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>">
	<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<?php

	artkombat_the_pageloader_overlay();
	get_template_part( 'navbar' ); 

	$pageheader_layout = artkombat_get_pageheader_layout();
	$artkombat_header_class = artkombat_get_pageheader_class();

	if ( $pageheader_layout != 'disabled' ) : ?>
	<header class="page-header  <?php echo esc_attr($artkombat_header_class); ?>">
	    <div class="container">   
	    	<?php
	    		artkombat_the_h1();			
				artkombat_the_breadcrumbs();
			?>	    
	    </div>	    
	</header>
	<?php endif; ?>
	<div class="container main-wrapper">

Page not found – Hello World !