Error above related posts

Hello everyone,

Just above my related posts I get this error message:

“Notice: WP_Query was called with an argument that is deprecated since version 3.1! “caller_get_posts” is deprecated. Use “ignore_sticky_posts” instead. in /customers/6/7/3/thinkingoftravel.com/httpd.www/wp-includes/functions.php on line 3318 ”

Please check one of my pages to see for yourself: https://www.thinkingoftravel.com/frank-ilfman-tel-aviv/

I have tried googling this error message, but I only get my own site. I tried turning off the related posts in theme settings (Papercuts Premium) and the error message went away.

What can I do to get rid of this error? Many thanks in advance!