Fatal error: Uncaught Error: Class "WP_Customize_Control" not found in /var/www/consorcisigma/wp-content/plugins/gp-premium/addons/generate-backgrounds/functions/controls.php:56 Stack trace: #0 {main} thrown in /var/www/consorcisigma/wp-content/plugins/gp-premium/addons/generate-backgrounds/functions/controls.php on line 56