Fatal error: Uncaught Error: Class 'WP_Customize_Section' not found in /home/muvaimar/public_html/wp-includes/customize/class-wp-customize-nav-menu-section.php:19
Stack trace:
#0 {main}
thrown in /home/muvaimar/public_html/wp-includes/customize/class-wp-customize-nav-menu-section.php on line 19