Passenger is not working

Hi,

I just installed passenger 3.0.(on rvm system, using sudo).
Strangely, gem path was not found.
So I did "sudo /var/lib/gems/1.8/bin/passenger-install-apache2-module".
Installation process was smooth.
I modified httpd.conf and added myapp.local configuration and modified
hosts for the local domain.
I also reloaded apache2.

When I visit the site from my browser, it just shows blank page.
No error.

What did I miss?

Thanks.

Sam

http://www.dimitri.eu/configure-ruby-on-rails-with-phusion-passenger-mod_rails/

gem install passenger
passenger-install-apache2-module

cd /etc/apache2/mods-available
sudo touch passenger.load
sudo vi passenger.load
   LoadModule passenger_module
/home/caritas/.rvm/gems/ruby-1.9.2-p0/gems/passenger-3.0.0/ext/apache2/mod_passenger.so

sudo touch passenger.conf
sudo vi passenger.conf
   PassengerRoot
/home/caritas/.rvm/gems/ruby-1.9.2-p0/gems/passenger-3.0.0
   PassengerRuby /home/caritas/.rvm/wrappers/ruby-1.9.2-p0/ruby

sudo a2enmod passenger
sudo /etc/init.d/apache2 restart