If you are unable to open Helix3 menu, follow below steps...
Opening this file ‘/plugins/system/helix3/helix3.php’, on line 49, there is a PHP code line:
JForm::addFormPath(JPATH_PLUGINS.’/system/helix3/params’);
when you find it, please change it to:
JForm::addFormPath(JPATH_PLUGINS.’/system/helix3/params’); if (is_object($data)) { $data = (array)$data; }