Fatal error: Uncaught Error: Class 'WP_Customize_Panel' not found in /var/www/html/wp-content/plugins/astroidz/customizer/kirki/modules/custom-sections/panels/class-kirki-panels-nested-panel.php:15 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/astroidz/customizer/kirki/modules/custom-sections/panels/class-kirki-panels-nested-panel.php on line 15