WP_Comment_Query not working

Hello there,
I’m currently working on a widget that shows recent comments in the sidebar. I used WP_Comment_Query for querying the recent comments. But the returned array is and empty array. Here is the code that I wrote:

$query_args = array(
	'number' => 5,
	'order' => 'DESC'
);

$recent_comments = new WP_Comment_Query($query_args);

And when I checked the returned array with print_r(); I got the following code:

WP_Comment_Query Object
(
    [meta_query] =>
)

I know that I can get recent comments with the help of get_comments(); function but I wonder why the class is not working. 🙁
Thanks in advance,
waiting for your reply.