Redmine

Hello
i've upgraded my redmine version from 1.4 to 2.3.2

everything seems to work(all issues and project are there) but i cannot add users nor view "settings" page nor view "My account"
i get "internal error" page

i've try to google it, gave the whole project 775(i don't mind cuz its only on my dev environment) and still nothing works...

there is nothing on the "production.log" file

i don't know if its related but when i try to do this comman: sudo rails server RAILS_ENV=production
i get this error:

Exiting
/usr/lib/ruby/gems/1.8/gems/rack-1.4.5/lib/rack/handler.rb:63:in `require': no such file to load -- rack/handler/rails__env=production (LoadError)
from /usr/lib/ruby/gems/1.8/gems/rack-1.4.5/lib/rack/handler.rb:63:in `try_require'
from /usr/lib/ruby/gems/1.8/gems/rack-1.4.5/lib/rack/handler.rb:16:in `get'
from /usr/lib/ruby/gems/1.8/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
from /usr/lib/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
from /usr/lib/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/commands.rb:55
from /usr/lib/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
from /usr/lib/ruby/gems/1.8/gems/railties-3.2.13/lib/rails/commands.rb:50
from script/rails:6:in `require'
from script/rails:6


Hope someone can help me with that...