undefined method `page_cache_directory' for ActionController::Base:Class
After doing some Google search, I found this article on stackoverflow, which pointed me to the right direction. Actually, Debian Wheezy comes with an pretty old version of Phusion Passenger (3.0.x), so I performed the following steps and installed a newer version (4.0.x) of Phusion Passenger from Wheezy Backports.
First I added Wheezy Backports to my apt sources file /etc/apt/sources.list
deb http://http.debian.net/debian wheezy-backports main
Next I used apt-get update to update the local apt repositories and finally I installed Phusion Passenger from the Wheezy Backports with the following command
apt-get -t wheezy-backports install "libapache2-mod-passenger"
After this, I restarted the apache2 process and Redmine 3.0.1 started successfully.