title: to_specs': Could not find chef (>= 0) amongst [] (Gem::LoadError)
body: <p>I am trying to install chef and knife ec2 plugin on my laptop to set up the workstation. Initially I use chef omnibus to install chef-client but after installing I encountered some problems, so a quick googling landed me to stackoverflow and couple of threads suggested me to install chef using gem. I am running on ruby 2.0.0-p0 and insalled chef and knife ec2 but I am getting a different issue now. I have posted the issue bleow, kindly have a look. </p>
  
  <p>Please help me out to fix me this issue</p>
  
  <pre><code>/home/jeevan/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:247:in `to_specs': Could not find chef (&gt;= 0) amongst [] (Gem::LoadError)
      from /home/jeevan/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:256:in `to_spec'
      from /home/jeevan/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems.rb:1231:in `gem'
      from /home/jeevan/.rvm/gems/ruby-2.0.0-p0/bin/chef-client:18:in `&lt;main&gt;'
      from /home/jeevan/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `eval'
      from /home/jeevan/.rvm/gems/ruby-2.0.0-p0/bin/ruby_noexec_wrapper:14:in `&lt;main&gt;'
  </code></pre>