Could not find rails (>= 0) amongst [] (Gem::LoadError)

Question

After installing rvm, updating .gmrc file, updating rubygems and running gem install rails -v ">=3.1.0rc", I now seem to have a complete mess:

$ rails -v /usr/local/lib/site_ruby/1.8/rubygems/dependency.rb:247:in `to_specs': Could not find rails (>= 0) amongst [] (Gem::LoadError)     from /usr/local/lib/site_ruby/1.8/rubygems/dependency.rb:256:in `to_spec'     from /usr/local/lib/site_ruby/1.8/rubygems.rb:1182:in `gem'     from /var/lib/gems/1.8/bin/rails:18 

---

myhome@myhome-mini:~$ gem env  RubyGems Environment:   - RUBYGEMS VERSION: 1.6.2   - RUBY VERSION: 1.9.2 (2011-02-18 patchlevel 180) [i686-linux]   - INSTALLATION DIRECTORY: /home/myhome/gems   - RUBY EXECUTABLE: /home/myhome/.rvm/rubies/ruby-1.9.2-p180/bin/ruby   - EXECUTABLE DIRECTORY: /home/myhome/gems/bin   - RUBYGEMS PLATFORMS:     - ruby     - x86-linux   - GEM PATHS:      - /home/myhome/gems      - /usr/lib/ruby/gems/1.8   - GEM CONFIGURATION:      - :update_sources => true      - :verbose => true      - :benchmark => false      - :backtrace => false      - :bulk_threshold => 1000      - "gemhome" => "/home/myhome/gems"      - "gempath" => ["/home/myhome/gems", "/usr/lib/ruby/gems/1.8"]   - REMOTE SOURCES:      - http://rubygems.org/ 

Answer 1

I've had a similiar problem. Not sure if that helps you, but you might try to install gems with rvmsudo gem install [gemname] instead of just doing gem install [gemname] or sudo gem install [gemname].

I try to explain this a bit because of the upvotes:
This basically is a path issue. If you set up gems via gem install, they mostly likely will be in another directory (e.g. /usr/local/) compared to gems set up via bundler (where you can override it with --path). Using sudo may also set them up into another directory since sudo starts a subshell which has a different environment then. This is why you have rvmsudo.

If you want to see the differences, compare $PATH, $GEM_HOME, $GEM_PATH and $BUNDLE_PATH when echoing directly, with sudo and with rvmsudo.