Headers already sent, but can't find error

I am getting a “headers already sent error” and i know that usually this is a formatting problem (being an extra space), but this time I can’t see where the issue could be.

I am separating out trackbacks and pings from comments.

Here is the part that is giving me a hard time:

<?php
/**
 * Comments
 */
	function squaredv2_comments($comment, $args, $depth) {
	$GLOBALS['comment'] = $comment; ?>
	<li <?php comment_class(); ?> id="li-comment-<?php comment_ID() ?>">
		<div id="comment-<?php comment_ID(); ?>">
			<div class="avatar">
				<?php echo get_avatar($comment,$size='66' ); ?>
			</div>

			<?php if ($comment->comment_approved == '0') : ?>
				<em><?php _e('Your comment is awaiting moderation.', 'white') ?></em>

			<?php endif; ?>

			<?php comment_text() ?>

			<div class="comment-meta">
				<div class="info vcard">
					<?php printf(__('<cite class="fn">%s</cite>, '), get_comment_author_link()) ?>
					<?php printf(__('%1$s at %2$s', 'white'), get_comment_date(),get_comment_time()) ?><?php edit_comment_link( __( '(Edit)', 'white' ), ' ' ) ?>
				</div>
				<?php if($args['max_depth']!=$depth) { ?>
				<div class="reply">
					<?php comment_reply_link(array_merge($args, array('depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
				</div>
			<?php } ?>
			</div>
			<div class="clear"></div>
		</div>
<?php } ?>
<?php
/**
 * trackbacks and pings
 */
	function squaredv2_pings($comment, $args, $depth) {
	$GLOBALS['comment'] = $comment; ?>
		<li id="comment-<?php comment_id(); ?>"><?php comment_author_link(); ?>
<?php } ?>

The error tells me that the problem is the opening php tag of the second set of code.