同时遵循 redmine 安装中的步骤
http://www.redmine.org/projects/redmine/wiki/RedmineInstall
me@me:/redmine-2.3$ sudo rake generate_secret_token
rake aborted!
uninitialized constant Gem::SourceIndex
/redmine-2.3/config/boot.rb:6
/redmine-2.3/config/application.rb:1
/redmine-2.3/Rakefile:5
在 Ubuntu 12.04.2 LTS 如何解决这个问题?