Fatal error: Uncaught Error: Class "WP_Customize_Panel" not found in D:\Inetpub\vhosts\puniterp.in\heetsteel.com\wp-includes\customize\class-wp-customize-themes-panel.php:17 Stack trace: #0 {main} thrown in D:\Inetpub\vhosts\puniterp.in\heetsteel.com\wp-includes\customize\class-wp-customize-themes-panel.php on line 17