After the installation followed from here https://www.digitalocean.com/community/tutorials/how-to-install-and-get-started-with-phalcon-on-an-ubuntu-12-04-vps when i run my Index.php. error ocured PHP Fatal error: Class 'Phalcon\Loader' not found in /home/amitoj/localhost/hello/public/index.php on line 5 how to resolve this? Thanks!