Shortcode is not running in footer

I added this plugin in my page. its working perfect. but i want to show it in footer.. its not running in footer. my code is

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

<footer id="colophon" class="site-footer" role="contentinfo">
<center>
<?php echo do_shortcode ('[print_thumbnail_slider]'); ?>
</center>
		<div class="site-info">

			Copyright ? <?php echo date('Y');?> <a>" title="<?php bloginfo('name'); ?>"><?php bloginfo('name'); ?></a> - <?php bloginfo('description'); ?> 

		</div><!-- .site-info -->
	</footer><!-- #colophon -->