portfolio Masonry 100%

Fatal error: Uncaught Error: Call to undefined function get_thegem_portfolio_render_item_classes() in /var/www/vhosts/vrankar.si/httpdocs/wp-content/plugins/thegem-elements/inc/content.php:754 Stack trace: #0 /var/www/vhosts/vrankar.si/httpdocs/wp-content/plugins/thegem-elements/inc/shortcodes/shortcodes.php(22001): thegem_portfolio() #1 /var/www/vhosts/vrankar.si/httpdocs/wp-includes/shortcodes.php(356): thegem_portfolio_shortcode() #2 [internal function]: do_shortcode_tag() #3 /var/www/vhosts/vrankar.si/httpdocs/wp-includes/shortcodes.php(228): preg_replace_callback() #4 /var/www/vhosts/vrankar.si/httpdocs/wp-content/plugins/thegem-elements/inc/shortcodes/shortcodes.php(878): do_shortcode() #5 /var/www/vhosts/vrankar.si/httpdocs/wp-includes/shortcodes.php(356): thegem_textbox_shortcode() #6 [internal function]: do_shortcode_tag() #7 /var/www/vhosts/vrankar.si/httpdocs/wp-includes/shortcodes.php(228): preg_replace_callback() #8 /var/www/vhosts/vrankar.si/httpdocs/wp-content/plugins/thegem-elements/inc/shortcodes/shortcod in /var/www/vhosts/vrankar.si/httpdocs/wp-content/plugins/thegem-elements/inc/content.php on line 754