Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/www/desarrollo.credito506.com/wp-content/plugins/demo-importer-plus/inc/importers/class-demo-importer-plus-sites-helper.php:40 Stack trace: #0 /home/www/desarrollo.credito506.com/wp-content/plugins/demo-importer-plus/inc/importers/class-demo-importer-plus-sites-helper.php(31): Demo_Importer_Plus_Sites_Helper->__construct() #1 /home/www/desarrollo.credito506.com/wp-content/plugins/demo-importer-plus/inc/importers/class-demo-importer-plus-sites-helper.php(271): Demo_Importer_Plus_Sites_Helper::get_instance() #2 {main} thrown in /home/www/desarrollo.credito506.com/wp-content/plugins/demo-importer-plus/inc/importers/class-demo-importer-plus-sites-helper.php on line 40