how to modify this code: elgg_view_layout

I find the code in the plugin: 'event_calendar':

$body = elgg_view_layout('two_column_left_sidebar', $area1,$area2);

It doesn't work,So i changed it like this:

$params = array(
    'content' => $area1,
    'sidebar' => $area2
$body = elgg_view_layout('one_sidebar', $params);

but there is nothing output to the page, how to modify the code correctly?

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