[Plugin: Events Manager] Fatal error when using own template single-event.php

Hi, maybe somebody can help me.

I use my own theme and plugin Events Manager 5.4.2. All works fine, but not single-event pages. I created my own template for them and called it single-event.php. I want to get header, 2 sidebars, menu and footer. But now I get the error: Fatal error: Call to a member function output_single() on a non-object instead of showing the event. I tried deleting single elements (as sidebars) but the problem is still there.

Here is my code:

<?php
* Template Name: Single-Event

get_header(); ?>

<div class=”container”>

<!– Sidebar laden –>

<div id=”sidebar”>
<?php
get_sidebar ();
?>
</div>
<!– end sidebar –>

<div id=”nav_kalender” role=”navigation”>

<?php wp_nav_menu( array( ‘theme_location’ => ‘untermenu-kalender’, ‘container_class’ => ‘my_extra_menu_class’ ) );?>
</div>
<!–end Untermenü Museum–>

<div class=”content2″>

<div id=Eventseite>

<?php
global $EM_Event;
/* @var $EM_Event EM_Event */
echo $EM_Event->output_single();
?>

</div>
<!– end EM content –>

</div>
<!– end content2 –>

<div id=”sidebar3″>
<?php get_template_part( ‘sidebar3’, ‘index’ ); ?>
</div>
<!– end Sidebar3 –>

</div>
<!– end inhalt –>

<?php
get_footer(); ?>

</div>
<!– end container –>

I’m quite new to php, I really hope somebody can help me.