title: therubyracer error ERROR: While executing gem ... (NoMethodError) undefined method `size' for nil:NilClass
body: <p>while installing therubyracer along with Ruby 2.0.0.p0 and Rails 4.0, i get the following error</p>
  
  <pre><code>ERROR:  While executing gem ... (NoMethodError)
      undefined method `size' for nil:NilClass
  </code></pre>
  
  <p>If I install same gem in using bundle install then I get dependent gem error see below log.</p>
  
  <pre><code>NoMethodError: undefined method `size' for nil:NilClass
  An error occurred while installing libv8 (3.16.14.3), and Bundler cannot continue.
  Make sure that `gem install libv8 -v '3.16.14.3'` succeeds before bundling.
  </code></pre>
  
  <p>Please find the link for GIT which i was trying to install 
  <a href="https://github.com/niquola/angularjs-on-rails" rel="nofollow">https://github.com/niquola/angularjs-on-rails</a></p>