Kaltura_Client_Exception thrown

Invalid KS "NzIzMjNiN2I1MjVhNTJlMGRiYTY0Y2ZhNzYzZTVjYzZlOWI1NzcwZXwxMDE7OzE0NjcxMTk3MzA7MjsxNDY3MDMzMzMwLjY2Mjk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"