In Joomla 1.5 to 2.5 we include directly the helper file or other file in the Joomla PHP code using require_once() method but in Joomla 3.0 you must defined the DS directory separator constant otherwise you getting error message.
defined('_JEXEC') or die('Restricted access'); require_once (dirname(__FILE__).DS.'helper.php');
Here is the right way to import your file using the DIRECTORY_SEPARATOR constant
defined('_JEXEC') or die('Restricted access'); if(!defined('DS')){ define('DS',DIRECTORY_SEPARATOR); } require_once (dirname(__FILE__).DS.'helper.php');
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