Kaltura_Client_Exception thrown

Invalid KS "ZjljMThmYTk0ODIyNGNhMGVhZDgyNjM4YWMzNjRlMmVlYzNjMTZiZHwxMDE7OzE0OTA1MjMxNzA7MjsxNDkwNDM2NzcwLjU0OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"