Ruby require 'rack' fails

I'm trying to install redmine and I have a problem with phusion-passenger. Installer fails on dependencies saying that rack is missing. I've investigated the code to check where it looks for it, but I've found a line:

require 'rack'

that is enclosed in what seems to be rubys try-catch block. I've al开发者_运维技巧ready installed rack through gem install rack -v=1.0.1 . I've got no idea what to do next to resolve this issue. Can anyone help?

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Try sudo gem install rack.