( ! ) Fatal error: Class 'WP_Customize_Panel' not found in C:\wamp64\www\site\wordpress\wp-includes\customize\class-wp-customize-nav-menus-panel.php on line 19
Call Stack
#	Time	Memory	Function	Location
1	0.0005	248592	{main}( )	...\class-wp-customize-nav-menus-panel.php:0