Fatal error: Uncaught Error: Class 'WP_Customize_Setting' not found in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-includes/customize/class-wp-customize-nav-menu-setting.php:21 Stack trace: #0 {main} thrown in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-includes/customize/class-wp-customize-nav-menu-setting.php on line 21