title: can't find gem rails - Gem::GemNotFoundException
body: <p>Using ubuntu 10.04, rvm. At first, I've installed ruby 1.9.2 with rvm, gem rails and generated some new project and started it successfully. Everything was working fine. But after changing to another project, executing bundle install command (output looks OK) and starting rails server - error occurs:</p>
  
  <p>rails s</p>
  
  <pre><code>/home/jacek/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/site_ruby/1.9.1/rubygems.rb:316:in `bin_path': can't find gem rails (["&gt;= 0"]) with executable rails (Gem::GemNotFoundException)
  from /home/jacek/.rvm/gems/ruby-1.9.2-p318/bin/rails:19:in `&lt;main&gt;'
  </code></pre>
  
  <p>gem list rails</p>
  
  <pre><code>*** LOCAL GEMS ***
  rails (3.2.2)
  </code></pre>
  
  <p>gem env</p>
  
  <pre><code>RubyGems Environment:
    - RUBYGEMS VERSION: 1.8.18
    - RUBY VERSION: 1.9.2 (2012-02-14 patchlevel 318) [i686-linux]
    - INSTALLATION DIRECTORY: /home/jacek/.rvm/gems/ruby-1.9.2-p318
    - RUBY EXECUTABLE: /home/jacek/.rvm/rubies/ruby-1.9.2-p318/bin/ruby
    - EXECUTABLE DIRECTORY: /home/jacek/.rvm/gems/ruby-1.9.2-p318/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86-linux
    - GEM PATHS:
       - /home/jacek/.rvm/gems/ruby-1.9.2-p318
       - /home/jacek/.rvm/gems/ruby-1.9.2-p318@global
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :benchmark =&gt; false
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - http://rubygems.org/
  </code></pre>
  
  <p>My Path (includes EXECUTABLE DIRECTORY: /home/jacek/.rvm/gems/ruby-1.9.2-p318/bin )</p>
  
  <pre><code>/home/jacek/.rvm/gems/ruby-1.9.2-p318/bin:/home/jacek/.rvm/gems/ruby-1.9.2-p318@global/bin:/home/jacek/.rvm/rubies/ruby-1.9.2-p318/bin:/home/jacek/.rvm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
  </code></pre>
  
  <p>I would be grateful for any help</p>