title: Unresolved specs during Gem::Specification.reset:
body: <p>When launching Guard, I'm getting this output:</p>
  
  <pre class="lang-none prettyprint-override"><code>$ guard
  WARN: Unresolved specs during Gem::Specification.reset:
        lumberjack (&gt;= 1.0.2)
        ffi (&gt;= 0.5.0)
  WARN: Clearing out unresolved specs.
  Please report a bug if this causes problems.
  </code></pre>
  
  <p>What does this mean, and how do I fix it?</p>
  
  <p>Contents of Guardfile:</p>
  
  <pre><code>guard 'livereload' do
      watch(%r{.+\.(css|js|html)$})
  end
  guard 'sass', :input =&gt; 'css', :style =&gt; :compressed, :extension =&gt; '.min.css'
  </code></pre>