Kaltura_Client_Exception thrown

Invalid KS "NTNhMzhhODgzY2Q0MzE4MTk5OWIwZTMzZjI0MGRhZmUyYmVkNjQ2M3wxMDE7OzE0OTMxMjA3MjE7MjsxNDkzMDM0MzIxLjMwMjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"