Kaltura_Client_Exception thrown

Invalid KS "YzdkYWUxNTZiYzU5MGNiNGE5MzBmMTM1ZGQwMTE0NzhiODk1ZTBiN3wxMDE7OzE0NzUyMTg5MjA7MjsxNDc1MTMyNTIwLjUzMDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"