Kaltura_Client_Exception thrown

Invalid KS "ZmVlMjZiYWEzY2RmNWU0MDNlOGY2ODA1ZTcwMWNlODJjZDY0MzRhMXwxMDE7OzE0ODgwNjgyNzA7MjsxNDg3OTgxODcwLjMxMzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"