Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/ravamerica/parts.ravamerica.com/wp-content/plugins/folders-pro/includes/class-bulk-download.php:27 Stack trace: #0 /home/ravamerica/parts.ravamerica.com/wp-content/plugins/folders-pro/includes/class-bulk-download.php(20): WCP_Pro_Folders_Bulk_Download->__construct() #1 /home/ravamerica/parts.ravamerica.com/wp-content/plugins/folders-pro/includes/class-bulk-download.php(174): WCP_Pro_Folders_Bulk_Download::get_instance() #2 {main} thrown in /home/ravamerica/parts.ravamerica.com/wp-content/plugins/folders-pro/includes/class-bulk-download.php on line 27