Fatal error: Uncaught Error: Class 'WP_Customize_Panel' not found in H:\root\home\agubski-002\www\alexgubski\blog\wp-includes\customize\class-wp-customize-nav-menus-panel.php:19
Stack trace:
#0 {main}
thrown in H:\root\home\agubski-002\www\alexgubski\blog\wp-includes\customize\class-wp-customize-nav-menus-panel.php on line 19