I have spent all day trying to get Redmine to work under Apache2 / Passenger. No luck... I'm stuck at:

*** Exception LoadError in PhusionPassenger::Railz::ApplicationSpawner (no such file to load -- dispatcher) (process 31835):
    from /var/lib/gems/1.8/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require'
    from /var/lib/gems/1.8/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require'
    from /var/lib/gems/1.8/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /var/lib/gems/1.8/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in `require'
    from /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:312:in `preload_application'
    from /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:252:in `initialize_server'
    from /usr/lib/ruby/1.8/phusion_passenger/utils.rb:255:in `report_app_init_status'
    from /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:237:in `initialize_server'
    from /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:194:in `start_synchronously'

What do I do? I keep on seeing "Redmine is in production use..." so which production web server should I use for this? I'm at my wit's end on this... Redmine seems like a good idea but getting it to install is like climbing a mountain. Thanks

EDIT: I got it to work!¶

The version of Passenger that comes with Ubuntu 12.04 isn't compatible. Not sure which version it is, but once I changed over to using Passenger 3.0.19 it all worked. Blah, what a long day of configuration. I really really wish I could run this within Tomcat and simplify the number of servers I need to know about....