I am also having similar issue, using elementor(1.2.4) page builder on wordpress(4.7.2) below error shows when adding Layer Slider to pages. I did try with widget, shortcode both in page builder and wordpress editor
Fatal error: Call to undefined function LayerSlider\PHPQuery\mb_ereg_match() in /home/softm3/public_html/wp-content/plugins/LayerSlider/helpers/phpQuery.php on line 1839
Can anyone help with this
