Kaltura_Client_Exception thrown

Invalid KS "YTVhMmRjYWY4NjM4NTdjMDk0YTRhNmViNjkwMDljNmE4OTA2YWNiOXwxMDE7OzE1MDA3MDY3Nzg7MjsxNTAwNjIwMzc4LjExMzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"