Fatal error: Uncaught Error: Class 'WP_Customize_Section' not found in C:\xampp\htdocs\aszhi\wp-includes\customize\class-wp-customize-sidebar-section.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\aszhi\wp-includes\customize\class-wp-customize-sidebar-section.php on line 17