Kaltura_Client_Exception thrown

Invalid KS "NzM5ZDcyM2JiZjFkZjRkZmU5YTc1NTA3ZDU0ZjU5NDgzNGRmZTIyYnwxMDE7OzE0NzUwMzU2NjI7MjsxNDc0OTQ5MjYyLjg1ODk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"