Kaltura_Client_Exception thrown

Invalid KS "M2MxZGU5Y2ZiYmIyNDgxNzkxYjlhZDUyMWM5Y2NhMjQ5ZGE5OTA1MnwxMDE7OzE0NzQ4OTQyNTU7MjsxNDc0ODA3ODU1LjMyMjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"