Kaltura_Client_Exception thrown

Invalid KS "N2I1YjUzMWUxNjAyYjJmZWMyMzIxYzBhM2NhM2VjMDk5M2IzZTIwNHwxMDE7OzE0ODc2NTE1MzU7MjsxNDg3NTY1MTM1LjIzNDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"