ErrorException [ Fatal Error ]: Call to undefined function _()

APPPATH/common/classes/oc/i18n.php [ 196 ]

191     {
192         //using the gettext dropin forced
193         if (self::$dropin === TRUE)
194             return _gettext($string);
195         else
196             return _($string);
197     }
198 
199     /**
200      * returns the number in the locale format
201      * @param  float $number 
  1. {
    Fatal error: Call to undefined function _() in /home/fpusalistednow/public_html/oc/common/classes/oc/i18n.php on line 196