I am also having this same issue, have removed the slider altogether, made a new one, but problem, fatal error code keeps appearing when shortcode included.

Fatal error: Call to undefined function layerslider_init() in /var/sites/d/dasexpert.co.uk/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow_layerslider.php on line 121