Fatal error: Uncaught Error: Class 'WP_Nav_Menu_Widget' not found in /var/app/current/wp-includes/class-wp-widget-factory.php:100 Stack trace: #0 /var/app/current/wp-includes/widgets.php(115): WP_Widget_Factory->register('WP_Nav_Menu_Wid...') #1 /var/app/current/wp-includes/widgets.php(1640): register_widget('WP_Nav_Menu_Wid...') #2 /var/app/current/wp-includes/class-wp-hook.php(286): wp_widgets_init('') #3 /var/app/current/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #4 /var/app/current/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #5 /var/app/current/wp-settings.php(450): do_action('init') #6 /var/app/current/wp-config.php(188): require_once('/var/app/curren...') #7 /var/app/current/wp-load.php(37): require_once('/var/app/curren...') #8 /var/app/current/wp-blog-header.php(13): require_once('/var/app/curren...') #9 /var/app/current/index.php(17): require('/var/app/curren...') #10 {main} thrown in /var/app/current/wp-includes/class-wp-widget-factory.php on line 100