Question

I have installed redmine and its working properly on webrick. I am trying to run it on apache and have installed passenger and its apache module. When I try to run redmine on apache i get this error messge

Ruby on Rails application could not be started

Error message:
Could not find RubyGem rack (~> 1.1.0)

I have rack 1.1.0 installed and the ruby 1.8.7

gem list shows this

actionmailer (2.3.14)
actionpack (2.3.14)
activerecord (2.3.14)
activeresource (2.3.14)
activesupport (2.3.14)
bundler (1.0.21)
daemon_controller (0.2.6)
fastthread (1.0.7)
json (1.6.5)
mysql (2.8.1)
passenger (3.0.11)
rack (1.1.0)
rails (2.3.14)
rake (0.9.2)
rdoc (3.12)

Answer 1

These gems might be installed for a specific user and the Apache user might not have access to that. In that case, be sure to install them globally, by doing a sudo gem install.....

It is also possible that you are using tools like rvm and have installed the gems into a specific gemset. See the rvm documentation if this is the case.