after comments it says 404 error.

<?php
if ( function_exists('register_sidebar') ) {
	register_sidebar(array(
    	'name' => 'Left Sidebar',
        'before_widget' => '<li id="%1$s" class="widget %2$s">',
        'after_widget' => '</li>',
        'before_title' => '<div id="widget">
				<div class="slmenu"></div>
				<div class="smenu"></div>
				<div class="srmenu"></div>
			</div><h2 class="widgettitle">',
        'after_title' => '</h2>',
    ));

}
function content($limit) {
  $content = explode(' ', get_the_content(), $limit);
  if (count($content)>=$limit) {
    array_pop($content);
    $content = implode(" ",$content).'...';
  } else {
    $content = implode(" ",$content);
  }
  $content = preg_replace('/\[.+\]/','', $content);
  $content = apply_filters('the_content', $content);
  $content = str_replace(']]>', ']]>', $content);
  return $content;
}

if(!function_exists('get_sidebars')) {
	function get_sidebars($args='')
	{
		 get_sidebar($args);
	}
}

if ( function_exists("add_theme_support") ) { add_theme_support("post-thumbnails"); } 

if ( ! function_exists( 'twentyeleven_comment' ) ) :
/**
 * Template for comments and pingbacks.
 *
...
etc.
...
		esc_html( get_the_author() )
	);
}

*/
endif;

?>

I have custom theme wordpress site. after comments it say, 404 error

I have testet with another theme and it is working finr I guess some issues in fucntions.php it was working fine 2 day earlier i have checked all plugins disbaled and enabled mathod, htaccess issues.

Any help is appreciated.

Thanks