Weird CruiseControl.rb cc:build errors

Every once in a a while I run into this error:

<p><img src="http://smartic.us/assets/2008/2/29/CruiseControl.rb.jpg" alt="" /></p>


<pre><code>"/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- cc:build (MissingSourceFile)"</code></pre>


<p>I have searched high and low, and I can&#8217;t figure out why this happens sometimes.  To get around the problem, I touch a file called &#8220;cc:build.rb&#8221; in the root of the work directory.  All of a sudden the problem goes away and my build is happy again.</p>