title: Heroku deployment error H10 (App crashed)
body: <p>I have a RoR app working on my local computer, but when I send it to heroku, it crashes. The error log gives an error H10 &amp; says:</p>
  
  <pre><code>    2012-11-21T15:26:47+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/newrelic_rpm-3.4.2/lib/new_relic/control/instance_methods.rb:95:in `start_agent'
      2012-11-21T15:26:48+00:00 heroku[web.1]: State changed from starting to crashed
      2012-11-21T15:26:48+00:00 heroku[web.1]: Process exited with status 1
      2012-11-21T15:26:59+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:27:00+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:30:08+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:30:08+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:30:59+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:31:19+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:31:19+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:32:08+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
      2012-11-21T15:32:08+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=xxx.herokuapp.com fwd= dyno= queue= wait= connect= service= status=503 bytes=
  </code></pre>
  
  <p>Edit:</p>
  
  <pre><code>2012-11-22T10:00:58+00:00 app[web.1]: 
  2012-11-22T10:00:59+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=xxx.herokuapp.com fwd= dyno=web.1 queue=0 wait=0ms connect=1ms service=26ms status=200 bytes=0
  </code></pre>
  
  <p>Has anyone had this before, and know what might be causing the problem? I cannot find a solution.</p>
  
  <p>Thanks.</p>