Kaltura_Client_Exception thrown

Invalid KS "YjVlNDlmOTViMjljZDViNmZlMGJmYjI0ZTA0ZDBiYTJiZDJlOWNjMXwxMDE7OzE0NzQ5NjIxNTg7MjsxNDc0ODc1NzU4LjU4NjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"