Related post for custom post type is not working.

I am creating a custom theme and getting trouble when trying to add related post.
Custom post: albums
single-album.php

<?php
/**
 * The template for displaying all single posts.
 *
 * @package MusiKian
 */

get_header(); ?>

	<div id="primary" class="content-area">
		<main id="main" class="site-main" role="main">

		<?php while ( have_posts() ) : the_post();
		?>

			<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
	<header class="entry-header">
		<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
	</header><!-- .entry-header -->
<div class="section group">
	<div class="col x9 entry-content">
		<?php the_content(); ?>
		<?php
			wp_link_pages( array(
				'before' => '<div class="page-links">' . __( 'Pages:', 'musikian' ),
				'after'  => '</div>',
			) );
		?>
	</div><!-- .entry-content -->
<div class="col x3"><?php include 'widget/contentad.php'; //contentad.php is empty ?></div>
</div>

	<footer class="entry-footer">
		<?php musikian_entry_footer(); ?>
	</footer><!-- .entry-footer -->
</article><!-- #post-## -->
<!--related post -->
<?php $orig_post = $post;
global $post;
$categories = get_the_category($post->ID);
if ($categories) {
$category_ids = array();
foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;

$args=array(
'post_type' => 'albums',
'category__in' => $category_ids,
'post__not_in' => array($post->ID),
'posts_per_page'=> 2, // Number of related posts that will be shown.
'caller_get_posts'=>1
);

$my_query = new wp_query( $args );
if( $my_query->have_posts() ) {
echo '<div id="related_posts"><h3>Related Posts</h3><ul>';
while( $my_query->have_posts() ) {
$my_query->the_post();?>

<li><div class="relatedthumb"><a href="<? the_permalink()?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_post_thumbnail(); ?></a></div>
<div class="relatedcontent">
<h3><a href="<? the_permalink()?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h3>
<?php the_time('M j, Y') ?>
</div>
</li>
<?
}
echo '</ul></div>';
}
}
$post = $orig_post;
wp_reset_query(); ?>
<!-- end of related post -->
			<?php
				// If comments are open or we have at least one comment, load up the comment template
				if ( comments_open() || get_comments_number() ) :
					comments_template();
				endif;
			?>

		<?php endwhile; // end of the loop. ?>

		</main><!-- #main -->
	</div><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

It return

Parse error: syntax error, unexpected ‘endwhile’ (T_ENDWHILE) in E:\Xampp2\htdocs\bdalbum\wp-content\themes\musikian\single-albums.php