Kaltura_Client_Exception thrown

Invalid KS "ZTNkMDQ3MzVlMzIyZjk3MGI1YTYyYWMzNGRiMDEwMDY5MGYyYjcwNHwxMDE7OzE0OTgzNjk4MTc7MjsxNDk4MjgzNDE3LjM1NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"