Problem mit der Functions.php

<?php
function wpe_excerptlenght_teaser($lenght) {
    return 22;
}
function wpe_excerptlenght_index($lenght) {
    return 70;
}
function wpe_excerptmore($more) {
    return '... <a href="'. get_permalink($post->ID) . '">' . '&raquo;' . '</a>';
}




function wpe_excerpt($lenght_callback='', $more_callback='') {
    global $post;
    if(function_exists($lenght_callback)){
        add_filter('excerpt_length', $lenght_callback);
    }
    if(function_exists($more_callback)){
        add_filter('excerpt_more', $more_callback);
    }
    $output = get_the_excerpt();
    $output = apply_filters('wptexturize', $output);
    $output = apply_filters('convert_chars', $output);
    $output = '<p>'.$output.'</p>';
    echo $output;
}




function mytheme_comment($comment, $args, $depth) {
   $GLOBALS['comment'] = $comment; ?>
   <li <?php comment_class(); ?> id='li-comment-<?php comment_ID() ?>'>
     <div id='comment-<?php comment_ID(); ?>'>
      <div class='comment-author vcard'>
         <?php echo get_avatar($comment,$size='48',$default='<path_to_url>' ); ?>


         <?php printf(__('<cite class='fn'>%s</cite> <span class='says'>says:</span>'), get_comment_author_link()) ?>
      </div>
      <?php if ($comment->comment_approved == '0') : ?>
         <em><?php _e('Your comment is awaiting moderation.') ?></em>
         <br />
      <?php endif; ?>


      <div class='comment-meta commentmetadata'><a href='<?php echo htmlspecialchars( get_comment_link( $comment->comment_ID ) ) ?>'><?php printf(__('%1$s at %2$s'), get_comment_date(),  get_comment_time()) ?></a><?php edit_comment_link(__('(Edit)'),'  ','') ?></div>


      <?php comment_text() ?>


      <div class='reply'>
         <?php comment_reply_link(array_merge( $args, array('depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
      </div>
     </div>


        }
?>