title: Uninstalling rails and gems, getting error "cannot uninstall, check 'gem list -d ...'
body: <p>I'm going to start with the usual noob line, "I'm new to rails".  Oh, and I'm running Mac OSX 10.6.4</p>
  
  <p>I've been following a bunch of guides to get set up, specifically these two <a href="http://www.robbyonrails.com/articles/2010/02/08/installing-ruby-on-rails-passenger-postgresql-mysql-oh-my-zsh-on-snow-leopard-fourth-edition/" rel="noreferrer">here</a> and <a href="http://spyrestudios.com/setting-up-a-rails-development-system-on-mac-osx-snow-leopard/" rel="noreferrer">here</a>.  The guides are great, the reason I'm using the second one is because of RVM and the reason I'm using the first is for MYSQL.</p>
  
  <p>Anyway, when I started, I wasn't following the directions completely and so after I installed RVM, for some reason I installed rails with <code>sudo gem install rails -v 2.3.8</code> because thats the version I need.  So... I realized I was using the system ruby, and wasn't taking advantage of RVM.  What I did now was install Ruby 1.9.2 so I can install rails 3 and test it out, and I also installed 1.8.7 and rails 2.3.8 so I can use it for what I need it.</p>
  
  <p>Now, I'm trying to uninstall the gems from the system Ruby, but whenever I try to I'm getting this error:</p>
  
  <blockquote>
    <p>ERROR: While executing gem ...
    (Gem::InstallError)<br>
      cannot uninstall, check 'gem list -d
    <strong><em>whatever gem I try to uninstall</em></strong>'</p>
  </blockquote>
  
  <p>Any ideas on how to remove rails and all these gems?  I just want to start from scratch with RVM.</p>
  
  <hr>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>By running the command <code>gem list -d rails</code> I've located the gems in /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/18.  Should I delete them manually?</p>