Passenger does not start Rails application - ruby-on-rails

Question

I am not sure if this is the correct part of the log
[ 2013-06-27 08:00:08.2593 16832/7fcf8d7a4740 agents/HelperAgent/Main.cpp:555 ]: PassengerHelperAgent online, listening at unix:/tmp/passenger.1.0.7663/generation-0/request
[Thu Jun 27 08:00:08 2013] [notice] Apache/2.2.22 (Ubuntu) Phusion_Passenger/4.0.5 configured -- resuming normal operations
[ 2013-06-27 08:00:08.2793 16829/7fc55d714740 agents/Watchdog/Main.cpp:564 ]: All Phusion Passenger agents started!
[ 2013-06-27 08:00:08.2794 16837/7fbb5e4c7740 agents/LoggingAgent/Main.cpp:271 ]: PassengerLoggingAgent online, listening at unix:/tmp/passenger.1.0.7663/generation-0/logging
[ 2013-06-27 08:00:14.7386 16832/7fcf8d6ee700 Pool2/Spawner.h:739 ]: [App 16906 stdout]
[ 2013-06-27 08:01:44.5986 16832/7fcf8d6ee700 Pool2/Implementation.cpp:774 ]: Could not spawn process for group /home/ubuntu/my_app/current#default: An error occurred while starting up the preloader: it did not write a startup response in time.
in 'void Passenger::ApplicationPool2::SmartSpawner::throwPreloaderSpawnException(const string&, Passenger::SpawnException::ErrorKind, Passenger::ApplicationPool2::Spawner::BackgroundIOCapturerPtr&, const DebugDirPtr&)' (SmartSpawner.h:150)
in 'std::string Passenger::ApplicationPool2::SmartSpawner::negotiatePreloaderStartup(Passenger::ApplicationPool2::SmartSpawner::StartupDetails&)' (SmartSpawner.h:558)
in 'void Passenger::ApplicationPool2::SmartSpawner::startPreloader()' (SmartSpawner.h:206)
in 'virtual Passenger::ApplicationPool2::ProcessPtr Passenger::ApplicationPool2::SmartSpawner::spawn(const Passenger::ApplicationPool2::Options&)' (SmartSpawner.h:744)
in 'void Passenger::ApplicationPool2::Group::spawnThreadRealMain(const SpawnerPtr&, const Passenger::ApplicationPool2::Options&, unsigned int)' (Implementation.cpp:707)
I read redirecting STDOUT could cause the problem, I searched STDOUT in all my config directory, but I am not using it.
In apache config file I have:
LoadModule passenger_module /home/ubuntu/.rbenv/versions/1.9.3-p429/lib/ruby/gems/1.9.1/gems/passenger-4.0.5/libout/apache2/mod_passenger.so
PassengerRoot /home/ubuntu/.rbenv/versions/1.9.3-p429/lib/ruby/gems/1.9.1/gems/passenger-4.0.5
PassengerDefaultRuby /home/ubuntu/.rbenv/versions/1.9.3-p429/bin/ruby
<VirtualHost *:80>
ServerName ip_with_numbers
# !!! Be sure to point DocumentRoot to 'public'!
DocumentRoot /home/ubuntu/my_app/current/public
<Directory /home/ubuntu/my_app/current/public>
# This relaxes Apache security settings.
AllowOverride all
# MultiViews must be turned off.
Options -MultiViews
</Directory>
</VirtualHost>
And I have also these outputs:
With sudo:
sudo passenger-memory-stats
command not found
W/o sudo:
passenger-memory-stats
...
17671 216.1 MB ? PassengerWatchdog
17674 562.6 MB ? PassengerHelperAgent
17679 165.7 MB ? PassengerLoggingAgent
And here is an image of page I am getting:
What am I missing?