Fatal error: Uncaught Error: Class 'WP_Customize_Panel' not found in /srv/users/globalmerchant/apps/globalmerchant/public/wp-includes/customize/class-wp-customize-themes-panel.php:17 Stack trace: #0 {main} thrown in /srv/users/globalmerchant/apps/globalmerchant/public/wp-includes/customize/class-wp-customize-themes-panel.php on line 17