title: ruby on rails: undefined method "version_requirements' when attempting to start server after new install
body: <p>I had to newly install ruby on rails recently.  When I attempted to start the server for a project I had already been working on previous to this new install, I received the following error:</p>
  
  <pre><code>$ ruby script/server
  =&gt; Booting WEBrick...
  ./script/../config/../vendor/rails/railties/lib/rails/gem_dependency.rb:107:in `requirement': undefined method `version_requirements' for #&lt;Gem::Dependency:0xb74bf764&gt; (NoMethodError)
      from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `check_gem_dependencies'
      from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `map'
      from ./script/../config/../vendor/rails/railties/lib/initializer.rb:292:in `check_gem_dependencies'
      from ./script/../config/../vendor/rails/railties/lib/initializer.rb:165:in `process'
  from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `send'
      from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `run'
      from /media/78C0-455B/bidmc/schedule/config/environment.rb:13
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/railties/lib/commands/servers/webrick.rb:59
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
      from /media/78C0-455B/bidmc/schedule/vendor/rails/railties/lib/commands/server.rb:49
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
      from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
      from script/server:3
  </code></pre>
  
  <p>I have the latest versions of ruby, rubygems, and rails. </p>
  
  <p>Any suggestions?</p>
  
  <p>Thanks.</p>