Fatal error: Uncaught Error: Call to undefined method Mega_Menu_Style_Manager::get_css_version() in /var/www/wp-content/plugins/megamenu/megamenu.php:550 Stack trace: #0 /var/www/wp-content/plugins/megamenu/megamenu.php(1301): Mega_Menu->get_mobile_close_button(Array, Array, Array) #1 /var/www/wp-includes/class-wp-hook.php(324): Mega_Menu->modify_nav_menu_args(Array) #2 /var/www/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #3 /var/www/wp-includes/nav-menu-template.php(102): apply_filters('wp_nav_menu_arg...', Array) #4 /var/www/wp-content/themes/vianet/includes/header.php(197): wp_nav_menu(Array) #5 /var/www/wp-includes/template.php(812): require('/var/www/wp-con...') #6 /var/www/wp-includes/template.php(745): load_template('/var/www/wp-con...', false, Array) #7 /var/www/wp-includes/general-template.php(206): locate_template(Array, true, false, Array) #8 /var/www/wp-content/themes/vianet/template-vacancy-form-page.php(5): get_template_part('includes/header') #9 /var/www/wp-includes/template-loader.php in /var/www/wp-content/plugins/megamenu/megamenu.php on line 550