title: What causes EventMachine::ConnectionNotBound?
body: <p>I'm new to EventMachine, so I'm not sure what this means.  I'm getting this exception:</p>
  
  <pre><code>EventMachine::ConnectionNotBound recieved ConnectionUnbound for an unknown signature: ef93a97d4d6441cb80d30fe2313d7de73
  </code></pre>
  
  <p>The program is fairly complicated, so I can't really explain everything that might have led up to it.  All I need is a pointer towards what to look for.  The error doesn't seem to be documented (looking at <a href="http://eventmachine.rubyforge.org/" rel="noreferrer">http://eventmachine.rubyforge.org/</a>).</p>