Kaltura_Client_Exception thrown

Invalid KS "N2Y2NzMwNjE2NzVjNWY3ZTQ2NmQ0YTg1MTY2NWRjOGYxYWExNjZjY3wxMDE7OzE0OTMzMjI3NjI7MjsxNDkzMjM2MzYyLjc1ODI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"