title: gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3> django
body: <p>I have a django app and trying to set it up with gunicorn first and later with supervisor and nginx.</p>
  
  <p>The app is running with the normal django command perfectly like <code>python manage.py runserver</code></p>
  
  <p>I installed the gunicorn using pip like <code>pip install gunicorn</code> and django version is <code>1.5.3</code></p>
  
  <p>when i run the below command inside the virtual env like below</p>
  
  <p><code>gunicorn  hello.wsgi:application -b xx.xxx.xxx.xx:8000</code> and faced the error</p>
  
  <pre><code>Traceback (most recent call last):
    File "/root/Envs/proj/bin/gunicorn", line 9, in &lt;module&gt;
      load_entry_point('gunicorn==19.0.0', 'console_scripts', 'gunicorn')()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/app/wsgiapp.py", line 74, in run
      WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/app/base.py", line 166, in run
      super(Application, self).run()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/app/base.py", line 71, in run
      Arbiter(self).run()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 169, in run
      self.manage_workers()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 477, in manage_workers
      self.spawn_workers()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 537, in spawn_workers
      time.sleep(0.1 * random.random())
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 209, in handle_chld
      self.reap_workers()
    File "/root/Envs/proj/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 459, in reap_workers
      raise HaltServer(reason, self.WORKER_BOOT_ERROR)
  gunicorn.errors.HaltServer: &lt;HaltServer 'Worker failed to boot.' 3&gt;
  </code></pre>
  
  <p>So why actually the above error is encountered and whats the fix ?</p>