title: Upgrading to Ruby 2.0.0 resulted in "Rails is not currently installed on this system"
body: <p>I recently upgraded from Ruby 1.9.3 to version 2.0.0. To do so, I used the following command:</p>
  
  <pre><code>$ rvm install ruby-2.0.0
  $ rvm --default use ruby-2.0.0
  </code></pre>
  
  <p>It successfully installed and set as default ruby-2.0.0; however, when I enter <code>ruby -v</code> I encounter the error:</p>
  
  <pre><code>Rails is not currently installed on this system. To get the latest version, simply type:
  
      $ sudo gem install rails
  
  You can then rerun your "rails" command.
  </code></pre>
  
  <p>I know Rails is installed and, before upgrading my version of Ruby, I ran rails -v which returned my current version.</p>
  
  <p><strong>Attempts to Troubleshoot</strong> </p>
  
  <p>I followed the solution found on <a href="https://stackoverflow.com/questions/7788946/rails-keeps-telling-me-that-its-not-currently-installed">an earlier post</a> and ran the following commands:</p>
  
  <pre><code>gemsets for ruby-1.9.3-p374 (found in /Users/.../.rvm/gems/ruby-1.9.3-p374)
     (default)
  =&gt; global
     rails3tutorial2ndEd
  
  /etc/rvmrc: line 5: install:: command not found
  /etc/rvmrc: line 6: update:: command not found
  
  gemsets for ruby-2.0.0-rc1 (found in /Users/.../.rvm/gems/ruby-2.0.0-rc1)
     (default)
  =&gt; global
  
  rvm use ruby-2.0.0-rc1@global
  </code></pre>
  
  <p>However, running <code>rails -v</code> again shows that the issue still persists.</p>
  
  <p>Any help would be greatly appreciated!</p>
  
  <p><strong>Update:</strong></p>
  
  <p>Impatience led me to just re-install Rails which fixed the problem. However, I'm still curious if there was a better way of troubleshooting this without (likely unnecessarily) re-installing Rails.</p>