Conditional tags not working

i create a single-events.php in my theme and put $em_event->output to display custom event content.. when i put this following code i get this error “CALL TO A MEMBER FUNCTION OUTPUT() ON A NON-OBJECT IN…”

anything wrong? the error message is on conditional event tags.. #_EVENTTAGS thank you..

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

				<div class="single-meta-top">

				<span class="single-subsector">
				<?php echo $EM_Event->output('{not_recurrence}#_EVENTTAGS{/not_recurrence}'); ?>
				<?php echo $EM_Event->output('{is_recurrence}#_EVENTCATEGORIES{/is_recurrence}');?>
				</span>

				<span class="single-date"><?php the_time('d M Y'); ?> </span>

				</div>

				<h1><?php the_title(); ?></h1>

				<?php echo $EM_Event->output('{not_recurrence}
				<div class="eventmeta">

				<p>by : #_ATT{Organizer}</p>
				#_EVENTDATES ,
				#_EVENTTIMES<br/>
				<p>
				#_LOCATIONNAME -
				#_LOCATIONADDRESS -
				#_LOCATIONTOWN
				</p>
				{/not_recurrence}');
				include 'include/sharrre.php';
				echo '</div>'; ?>

				<?php echo $EM_Event->output('{is_recurrence}<hr class="garis"></hr>{/is_recurrence}');?>
			  	<div class="content-post"> <?php the_content(); ?></div>

				<?php endwhile; else: ?>
					<p><?php _e('Sorry, this page does not exist.'); ?></p>
				<?php endif; ?>

http://ww.wp.xz.cn/plugins/events-manager/