Kaltura_Client_Exception thrown

Invalid KS "Y2Y0YzAyNzA2YWFjZDIwNzNkN2RlNDc1MTI0MGYzYTljM2UwYTFiNXwxMDE7OzE0NzUzMDYzNzA7MjsxNDc1MjE5OTcwLjgwNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"