Ayuda white screen dead.. Functions.php no encuentro el error

<?php
?>
<?php
?>

<?php
$themename = "ThemeBase";
$shortname = "tb";
$categories = get_categories('hide_empty=0&orderby=name');
$wp_cats = array();
foreach ($categories as $category_list ) {
       $wp_cats[$category_list->cat_ID] = $category_list->cat_name;
}
array_unshift($wp_cats, "Choose a category");

$options = array (
  
array( "name" => $themename." Options",
    "type" => "title"),
  
 
array( "name" => "General",
    "type" => "section"),
array( "type" => "open"),
     
array( "name" => "URL de tu logo",
    "desc" => "Ingresa el link de tu imagen de logo",
    "id" => $shortname."_logo",
    "type" => "text",
    "std" => ""),

array( "name" => "Proximo",
    "desc" => "Ingresa el texto que quieras que salga para ver los proximos posts",
    "id" => $shortname."_proximo",
    "type" => "text",
    "std" => "Ej: Siguiente Video"),
    
    array( "name" => "Anterior",
    "desc" => "Ingresa el texto que quieras que salga para ver los posts viejos o anteriores",
    "id" => $shortname."_anterior",
    "type" => "text",
    "std" => "Ej: Video Anterior"),
    
     array( "name" => "Link de facebook",
    "desc" => "Ingresa el link para que den like en el header",
    "id" => $shortname."_linkfb",
    "type" => "text",
    "std" => "Ej: www.facebook.com/viceados"),
     
array( "name" => "Copyright en el footer",
    "desc" => "Inserta el contenido que quieras, puede ser HTML",
    "id" => $shortname."_footer_text",
    "type" => "text",
    "std" => get_bloginfo('name') ."&copy - Rellenalo"),
     
array( "name" => "Codigo de Google Analytics",
    "desc" => "Pega tu tracking code aca y automaticamente se ubicara en el footer.",
    "id" => $shortname."_ga_code",
    "type" => "textarea",
    "std" => ""),    
     
array( "name" => "Favicon",
    "desc" => "Un favicon es una imagen de 16x16 pixel que representa tu sitio es una imagen .ico pega la url aca.",
    "id" => $shortname."_favicon",
    "type" => "text",
    "std" => get_bloginfo('url') ."/favicon.ico"),   
    
array( "type" => "close")
  
);

function mytheme_add_admin() {
  
global $themename, $shortname, $options;
  
if ( $_GET['page'] == basename(__FILE__) ) {
  
    if ( 'save' == $_REQUEST['action'] ) {
  
        foreach ($options as $value) {
        update_option( $value['id'], $_REQUEST[ $value['id'] ] ); }
  
foreach ($options as $value) {
    if( isset( $_REQUEST[ $value['id'] ] ) ) { update_option( $value['id'], $_REQUEST[ $value['id'] ]  ); } else { delete_option( $value['id'] ); } }
  
    header("Location: admin.php?page=functions.php&saved=true");
die;
  
} 
else if( 'reset' == $_REQUEST['action'] ) {
  
    foreach ($options as $value) {
        delete_option( $value['id'] ); }
  
    header("Location: admin.php?page=functions.php&reset=true");
die;
  
}
}
  
add_menu_page($themename, $themename, 'administrator', basename(__FILE__), 'mytheme_admin');
}
 
function mytheme_add_init() {
$file_dir=get_bloginfo('template_directory');
wp_enqueue_style("functions", $file_dir."/functions/functions.css", false, "1.0", "all");
wp_enqueue_script("rm_script", $file_dir."/functions/rm_script.js", false, "1.0");
}
function mytheme_admin() {
  
global $themename, $shortname, $options;
$i=0;
  
if ( $_REQUEST['saved'] ) echo '<div id="message" class="updated fade"><p><strong>'.$themename.' settings saved.</strong></p></div>';
if ( $_REQUEST['reset'] ) echo '<div id="message" class="updated fade"><p><strong>'.$themename.' settings reset.</strong></p></div>'; 
?>
<div class="wrap rm_wrap">
<h2>Panel de control de <?php echo $themename; ?></h2> 
<div class="rm_opts">
<form method="post">
<?php foreach ($options as $value) {
switch ( $value['type'] ) { 
case "open":
?>
<?php break;
  
case "close":
?>  
</div>
</div>
<br /> 
<?php break;
case "title":
?>
<p>Panel de control de <?php echo $themename;?>, gracias por usar nuestro template!</p>
<?php break;
case 'text':
?>
<div class="rm_input rm_text">
    <label for="<?php echo $value['id']; ?>"><?php echo $value['name']; ?></label>
    <input name="<?php echo $value['id']; ?>" id="<?php echo $value['id']; ?>" type="<?php echo $value['type']; ?>" value="<?php if ( get_settings( $value['id'] ) != "") { echo stripslashes(get_settings( $value['id'])  ); } else { echo $value['std']; } ?>" />
 <small><?php echo $value['desc']; ?></small><div class="clearfix"></div>
 </div>
<?php
break;
case 'textarea':
?>
 
<div class="rm_input rm_textarea">
    <label for="<?php echo $value['id']; ?>"><?php echo $value['name']; ?></label>
    <textarea name="<?php echo $value['id']; ?>" type="<?php echo $value['type']; ?>" cols="" rows=""><?php if ( get_settings( $value['id'] ) != "") { echo stripslashes(get_settings( $value['id']) ); } else { echo $value['std']; } ?></textarea>
 <small><?php echo $value['desc']; ?></small><div class="clearfix"></div>
</div>
<?php
break;
case 'select':
?>
<div class="rm_input rm_select">
    <label for="<?php echo $value['id']; ?>"><?php echo $value['name']; ?></label>
     
<select name="<?php echo $value['id']; ?>" id="<?php echo $value['id']; ?>">
<?php foreach ($value['options'] as $option) { ?>
        <option <?php if (get_settings( $value['id'] ) == $option) { echo 'selected="selected"'; } ?>><?php echo $option; ?></option><?php } ?>
</select>
    <small><?php echo $value['desc']; ?></small><div class="clearfix"></div>
</div>
<?php
break; 
case "checkbox":
?>
<div class="rm_input rm_checkbox">
    <label for="<?php echo $value['id']; ?>"><?php echo $value['name']; ?></label>
     
<?php if(get_option($value['id'])){ $checked = "checked=\"checked\""; }else{ $checked = "";} ?>
<input type="checkbox" name="<?php echo $value['id']; ?>" id="<?php echo $value['id']; ?>" value="true" <?php echo $checked; ?> />
    <small><?php echo $value['desc']; ?></small><div class="clearfix"></div>
 </div>
<?php break;
case "section":
$i++;
?>
<div class="rm_section">
<div class="rm_title"><h3><img src="<?php bloginfo('template_directory')?>/functions/plus.png" class="inactive" alt="""><?php echo $value['name']; ?></h3><span class="submit"><input name="save<?php echo $i; ?>" type="submit" value="Guardar cambios" />
</span><div class="clearfix"></div></div>
<div class="rm_options">
<?php break;
  
}
}
?> 
<input type="hidden" name="action" value="save" />
</form>
<form method="post">
<p class="submit">
<input name="reset" type="submit" value="Reset" />
<input type="hidden" name="action" value="reset" />
</p>
</form>
<div style="font-size:9px; margin-bottom:10px;">Desarrollado por: <a href="http://jfgancia.com/">JuanFraGancia</a></div>
</div> 
<?php
}
 
add_action('admin_init', 'mytheme_add_init');
add_action('admin_menu', 'mytheme_add_admin');



//Agregamos soporte para menus personalizados
add_action('init','registrar_menu');
 
//Registramos un nuevo menu personalizado
function registrar_menu() {
register_nav_menu('menuprincipal', __('Menu Principal'));
}

add_theme_support( 'post-thumbnails' );
add_image_size( 'sidebarpostimage', 100, 100 );
add_image_size( 'sidebarimage', 200, 100 );
 

add_action('admin_menu', 'custom_fields_video');
function custom_fields_video() {
    add_meta_box('video','Url del video','fn_video','post','normal','high');
}

function fn_video() {
    global $wpdb, $post;
    $value  = get_post_meta($post->ID, video, true);
    echo '<label for="image_es">URL del video</label>
    <input type="text" name="video" id="video" value="'.htmlspecialchars($value).'" style="width: 100px;" />';
}

add_action('publish_post', 'save_videourl');
function save_videourl() {
   global $wpdb, $post;
    if (!$post_id) $post_id = $_POST['post_ID'];
    if (!$post_id) return $post;
    $video= $_POST['video'];
    update_post_meta($post_id, 'video', $video);
}
 
 
 // Registro Sidebar
register_sidebar(array(
'name' => 'Sidebar',
'id' => 'Sidebar',
'before_widget' => '',
'after_widget' => '',
'before_title' => '',
'after_title' => '',
'description' => 'Sidebar derecho del sitio'
));

register_sidebar(array(
'name' => 'AdHead',
'id' => 'AdHead',
'before_widget' => '',
'after_widget' => '',
'before_title' => '',
'after_title' => '',
'description' => '728x90'
));

register_sidebar(array(
'name' => 'AdPostTop',
'id' => 'AdPostTop',
'before_widget' => '<div class="adtop>"',
'after_widget' => '</div>',
'before_title' => '',
'after_title' => '',
'description' => '590px de ancho maximo'
));

register_sidebar(array(
'name' => 'AdPostBot',
'id' => 'AdPostBot',
'before_widget' => '<div class="adbot>',
'after_widget' => '</div>',
'before_title' => '',
'after_title' => '',
'description' => '590px de ancho maximo'
));


function mpw_create_widget(){    
    register_widget('mpw_widget');
}
add_action('widgets_init','mpw_create_widget');  


 
class mpw_widget extends WP_Widget {
 
     function mpw_widget(){
        $widget_ops = array('classname' => 'mpw_widget', 'description' => "Los ultimos 4 posts" );
        $this->WP_Widget('mpw_widget', "Ultimos Posts", $widget_ops);
    }
 
     function widget($args,$instance){
        echo $before_widget;    
        ?>
        <div class="ultimosposts">
        <?php if(have_posts()) : ?>
				  			<?php query_posts('cat=1&showposts=4'); while(have_posts()) : the_post(); ?>
				  			<div class="otros">
				  				<div class="thumbnailvideo">
				  					<div class="marcothumb">
					  					<a href="<?php the_permalink()?>"><?php the_post_thumbnail('sidebarimage'); ?></a>
				  					</div>
				  				</div>
				  				<div class="headthumbnail">
				  					<span class="textothumbnail">
				  						<a href="<?php the_permalink()?>"><?php the_title(); ?></a>
				  					</span>
				  					<span class="linkthumbnail">
				  						<a href="<?php the_permalink()?>">Ver mas</a>
				  					</span>
				  				</div>
				  			</div>
				  			 <?php endwhile; ?>
					   <?php endif; ?>
					   </div>
        <?php
        echo $after_widget;
    }
    function update($new_instance, $old_instance){
        // Función de guardado de opciones   
    }
    function form($instance){
        // Formulario de opciones del Widget, que aparece cuando añadimos el Widget a una Sidebar
    }    
} 
?>