Ultimate Addons Elements

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Fatal error: Uncaught Error: Call to undefined function vc_shortcode_custom_css_class() in /home/customer/www/livingstone-english.com/public_html/wp-content/plugins/Ultimate_VC_Addons/modules/Ultimate_Modals.php:92 Stack trace: #0 /home/customer/www/livingstone-english.com/public_html/wp-includes/shortcodes.php(343): Ultimate_Modals->modal_shortcode(Array, 'In user interfa...', 'ultimate_modal') #1 [internal function]: do_shortcode_tag(Array) #2 /home/customer/www/livingstone-english.com/public_html/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(ultima...', 'do_shortcode_ta...', '[ultimate_modal...') #3 /home/customer/www/livingstone-english.com/public_html/wp-content/themes/Impreza/framework/shortcodes/vc_column.php(70): do_shortcode('[ultimate_modal...') #4 /home/customer/www/livingstone-english.com/public_html/wp-content/themes/Impreza/framework/functions/shortcodes.php(137): require('/home/customer/...') #5 /home/customer/www/livingstone-english.com/public_html/wp-includes/shortcodes.php(343): US_S in /home/customer/www/livingstone-english.com/public_html/wp-content/plugins/Ultimate_VC_Addons/modules/Ultimate_Modals.php on line 92