Kaltura_Client_Exception thrown

Invalid KS "YjlmZDdjNjA3NzVjZGU3MWEwMmVjYTAwMGIzMTU5MTMwNzdiMzQ3NHwxMDE7OzE0OTM1MzIxMDk7MjsxNDkzNDQ1NzA5LjQ5NzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"