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

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.

Answer 2

I had to sudo gem install bundler to make it work again.

Answer 3

I got a problem similar to this, there may be a compatible problem of rvm.
I fixed by updating rvm to latest version:
curl -L https://get.rvm.io | bash -s stable --ruby
Then you should reload rvm or just open new terminal window.
Then I reinstalled the bundler 'gem install bundler' and ran 'bundle install' as normal

Answer 4

rvm rubygems current
did the trick for me.

Answer 5

remove ruby first
then
sudo apt-get install build-essential libssl-dev libreadline5 libreadline5-dev zlib1g zlib1g-dev
to install all needed lib
then you could install ruby and rails
rvm install 1.9.3
rvm --default use 1.9.3
rvm gem install rails

Answer 6

I had pretty much the same message when trying to generate a controller after installing IntelliJ IDEA and the associated Plugin for Rail Dev. From my app directory I just executed bundle install and was then able to generate controllers again.

Answer 7

I know this is a really old question but I just recently decided to move to RVM on a server I had setup a while ago and was having this same problem where gems were being installed in the wrong place and it was just messing everything up.
After a few hours of crawling through SO, I finally figured out that in my .gemrc file in my root folder, I had previously setup the gemhome: and gempath: variables and they were messing with the whole system.
After removing these lines, all my gems were working property.
Just thought I would post my answer in case someone was in the same position.