title: ROR can't fine rake 10.0.4 despite being in vendor/cache
body: <p>So this is annoying. When I put </p>
  
  <pre><code>bundle exec rake db:migrate
  </code></pre>
  
  <p>into terminal, the following error occurs: </p>
  
  <pre><code>Could not find rake-10.0.4 in any of the sources
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p>So I check with <code>bundle show rake</code>and it's there in: </p>
  
  <p>/rails_projects/principia_app/vendor/cache/ruby/1.8/gems/rake-10.0.4.</p>
  
  <p>I've tried deleting the gemfile.lock and running <code>bundle install --path vendor/cache</code> and the same error occurs. </p>
  
  <p>Also, I've tried doing it using gem 'rake','10.0.4' in the gemfile and without yielding the same results. I've updated all my gems too.</p>
  
  <p>I haven't had any issues until now, and for some reason is happing today. Any ideas? Thanks!!</p>