error Incorrect usage/placement of 'SQL_CALC_FOUND_ROWS'

Hi,

I have a CPT named question and and connection named q_to_q which connects question to question.

In my home.php I would like to display some questions and their related questions.

When I try to use the function p2p_type I get a sql error to the errorlog.

(This is partial code, just with the p2p_type function usage, without looping it).
If I remvoe the p2p_type function – there are no errors.

<?php
$args = array(	'post_type' => 'question',
			  'posts_per_page' => 5,
			  'order' => 'DESC',
		);
$questions = new WP_Query($args);
p2p_type( 'q_to_q' )->each_connected( $questions,array(),'ques_var' );  

if ($questions->have_posts()) :
	while ($questions->have_posts()) : $questions->the_post(); ?>

	<article id="post-<?php the_ID(); ?>">
	<h2><a href="<?php echo get_permalink($questions->post->ID) ?>"><?php echo get_the_title($questions->post->ID); ?></a></h2>
	</article>

<?php endwhile;
else :
endif;
?>

But when I just add the p2p_type function, this is what I get in the errorlog:

WordPress database error Incorrect usage/placement of 'SQL_CALC_FOUND_ROWS' for query SELECT   tcmb_posts.*, tcmb_p2p.* FROM tcmb_posts  INNER JOIN tcmb_p2p WHERE 1=1  AND tcmb_posts.post_type IN ('question') AND (tcmb_posts.post_status = 'publish' OR tcmb_posts.post_author = 1 AND tcmb_posts.post_status = 'private') AND (tcmb_p2p.p2p_type = 'q_to_q' AND (\n\t\t\t\t\t(tcmb_posts.ID = tcmb_p2p.p2p_to AND tcmb_p2p.p2p_from IN (SELECT SQL_CALC_FOUND_ROWS  tcmb_posts.ID FROM tcmb_posts  WHERE 1=1  AND tcmb_posts.ID IN (22) AND tcmb_posts.post_type IN ('question') AND (tcmb_posts.post_status = 'publish' OR tcmb_posts.post_author = 1 AND tcmb_posts.post_status = 'private')  ORDER BY tcmb_posts.post_date DESC LIMIT 0, 1)) OR\n\t\t\t\t\t(tcmb_posts.ID = tcmb_p2p.p2p_from AND tcmb_p2p.p2p_to IN (SELECT SQL_CALC_FOUND_ROWS  tcmb_posts.ID FROM tcmb_posts  WHERE 1=1  AND tcmb_posts.ID IN (22) AND tcmb_posts.post_type IN ('question') AND (tcmb_posts.post_status = 'publish' OR tcmb_posts.post_author = 1 AND tcmb_posts.post_status = 'private')  ORDER BY tcmb_posts.post_date DESC LIMIT 0, 1))\n\t\t\t\t))  ORDER BY tcmb_posts.post_date DESC  made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/gisha_mediaproduct/home.php'), P2P_Connection_Type->each_connected, P2P_Directed_Connection_Type->get_connected, P2P_Directed_Connection_Type->abstract_query, P2P_Side_Post->do_query, WP_Query->__construct, WP_Query->query, WP_Query->get_posts, referer: http://gisha-qanda.local/question/22

I already have another site using sort of the same logic, and it works, I just can’t figure out why I get this error here.
Maybe the error caused because the connection is between the same post type? (question to question)? I’d really appreciate your help solving this one, what am I missing here?
Thanks

http://ww.wp.xz.cn/extend/plugins/posts-to-posts/