Redmine

Are you trying to serve the app through passenger or fcgi?

I use hosting service to host redmine (monsterhost), so I'm not really sure, but judging from the framework trace - fcgi.
If there is a way I can know for sure, please, tell me.

last fragment of the framework trace:

 ...
/home1/olkiinfo/ruby/app_redmine/vendor/rails/railties/lib/fcgi_handler.rb:51:in `process!'
/home1/olkiinfo/ruby/app_redmine/vendor/rails/railties/lib/fcgi_handler.rb:23:in `process!'
dispatch.fcgi:24

Mmh, just had a look and I can't really find any docs on their page. Just the hugest hunch/guess: try renaming the redmine_dir/public/.htaccess file to something else, because I can remember it interfering with passenger, so if they use passenger it should work without it (make sure to reload your apache instance though for the change to be noticed). If it doesn't work, please post a link to the guide you followed to get a rails app installed on their shared hosts.

Well, I used at least three guides and messed a lot with cPanel.
Renamed .htaccess - it just shows me a folder index.

To be sure, I did everything once again, using these guides:

http://www.publictraffic.megazulu.com/?p=14
http://hibiscustech.com/blog/2009/07/29/ruby-on-rails-and-hostmonster/

And I got completely different results (since I didn't mess with cPanel's Ruby on rails). I've got 500 error .
AND I was able to run webrick, but I have absolutely no Idea what address should I connect to. (also, I don't know how to shut down daemon =_=).
Renamed .htaccess - it just shows me a folder index.

So, I also tried to do everything with JUST cPanel's Ruby on rails... but I failed there too:

I'm really sorry but I won't be able to help you untangle this. Try to get redmine running with webrick (you call that one with script/server and some options in the redmine directory) to make sure redmine runs ok. Then you can decide what you want to serve redmine with and stick with one guide to install it.

Since it seems a bit hopeless I'll run redmine on my friend's VPS instead.

Thanks anyway!
It's very nice to how you try to help everyone.
Good job!

It seems to me that the method l() of I18n class was overridden by another module or class.
Check your custom modules and plugins to ensure that the method l() was not overridden.
Another reason may be the include Redmine::I18n command was declared outside a module or class.
Example:

include Redmine::I18n # => CAUSE ERROR I18n::ArgumentError
class MyClass
...
end

1. CORRECT

class MyClass
include Redmine::I18n
end

Best regards!

Sorry, here is the correct example:

*include Redmine::I18n* # => CAUSE ERROR I18n::ArgumentError
class MyClass 
 ... 
end

To correct it:

class MyClass 
 include Redmine::I18n
end