Fatal error: Uncaught Error: Class 'WP_Customize_Section' not found in /nfs/bronfs/uwfs/hw00/d99/b4t/wordpress/wp-includes/customize/class-wp-customize-nav-menu-section.php:19 Stack trace: #0 {main} thrown in /nfs/bronfs/uwfs/hw00/d99/b4t/wordpress/wp-includes/customize/class-wp-customize-nav-menu-section.php on line 19