Kaltura_Client_Exception thrown

Invalid KS "NzI3OWRjYzVjYjJjZTNhYjhhYzVlYzExMzJlMWM3ZTI3ZmEyZjU0Y3wxMDE7OzE0NzU0MzU0MjQ7MjsxNDc1MzQ5MDI0LjAyNzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"