portfolio justified 4x

Fatal error: Uncaught Error: Call to undefined function get_thegem_portfolio_render_item_classes() in /home/customer/www/rhodaradar.com/public_html/wp-content/plugins/thegem-elements/inc/content.php:754 Stack trace: #0 /home/customer/www/rhodaradar.com/public_html/wp-content/plugins/thegem-elements/inc/shortcodes/shortcodes.php(22002): thegem_portfolio(Array) #1 /home/customer/www/rhodaradar.com/public_html/wp-includes/shortcodes.php(356): thegem_portfolio_shortcode(Array, '', 'gem_portfolio') #2 [internal function]: do_shortcode_tag(Array) #3 /home/customer/www/rhodaradar.com/public_html/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(gem_po...', 'do_shortcode_ta...', '[gem_portfolio ...') #4 /home/customer/www/rhodaradar.com/public_html/wp-content/plugins/js_composer/include/helpers/helpers.php(246): do_shortcode('[gem_portfolio ...') #5 /home/customer/www/rhodaradar.com/public_html/wp-content/themes/thegem/vc_templates/vc_column.php(161): wpb_js_remove_wpautop('[gem_portfolio ...') #6 /home/customer/ in /home/customer/www/rhodaradar.com/public_html/wp-content/plugins/thegem-elements/inc/content.php on line 754