Kaltura_Client_Exception thrown

Invalid KS "NjNmNTJlNzhhYjI4Zjg0ZWIwM2RkMDBmMmQ5MmFiYjhmYWVjMjFmNHwxMDE7OzE0NzQ5NDIyODE7MjsxNDc0ODU1ODgxLjIzNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"