The mcrypt extension is missing. Please check your PHP configuration in ubuntu 14.04

solusi nya yaitu enable kan exstensi mcrypt,lakukan seperti berikut

sudo apt-get install php5-mcrypt
sudo ln -s /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available
sudo php5enmod mcrypt 
sudo service apache2 restart

selesai.