title: Docker Error while fetching server API version
body: <p>I'm playing with OpenAI's universe, and when I click run, it comes up with an error.</p>
  
  <p>Current script: </p>
  
  <pre><code>import gym
  import universe  # register the universe environments
  
  env = gym.make('flashgames.CoasterRacer-v0')
  observation_n = env.reset()
  </code></pre>
  
  <p>If I remove the observation_n variable, it won't come up with an error. With the observation_n it will cause an error. Right now I'm running <code>docker-py (1.10.3)</code>.</p>
  
  <pre><code>[2016-12-11 18:32:12,128] Making new env: flashgames.CoasterRacer-v0
  [2016-12-11 18:32:12,132] Writing logs to file: /tmp/universe-10547.log
  Traceback (most recent call last):
    File "/home/ubuntu/workspace/gim.py", line 5, in &lt;module&gt;
      observation_n = env.reset()
    File "/home/ubuntu/workspace/gym/gym/core.py", line 137, in reset
      self.configure()
    File "/home/ubuntu/workspace/gym/gym/core.py", line 246, in configure
      self._configure(*args, **kwargs)
    File "/home/ubuntu/workspace/universe/universe/vectorized/core.py", line 57, in _configure
      super(Wrapper, self)._configure(**kwargs)
    File "/home/ubuntu/workspace/gym/gym/core.py", line 350, in _configure
      return self.env.configure(*args, **kwargs)
    File "/home/ubuntu/workspace/gym/gym/core.py", line 246, in configure
      self._configure(*args, **kwargs)
    File "/home/ubuntu/workspace/universe/universe/wrappers/render.py", line 18, in _configure
      super(Render, self)._configure(**kwargs)
    File "/home/ubuntu/workspace/universe/universe/vectorized/core.py", line 57, in _configure
      super(Wrapper, self)._configure(**kwargs)
    File "/home/ubuntu/workspace/gym/gym/core.py", line 350, in _configure
      return self.env.configure(*args, **kwargs)
    File "/home/ubuntu/workspace/gym/gym/core.py", line 246, in configure
      self._configure(*args, **kwargs)
    File "/home/ubuntu/workspace/universe/universe/wrappers/throttle.py", line 27, in _configure
      super(Throttle, self)._configure(**kwargs)
    File "/home/ubuntu/workspace/universe/universe/vectorized/core.py", line 57, in _configure
      super(Wrapper, self)._configure(**kwargs)
    File "/home/ubuntu/workspace/gym/gym/core.py", line 350, in _configure
    File "/home/ubuntu/workspace/gym/gym/core.py", line 246, in configure
      self._configure(*args, **kwargs)
    File "/home/ubuntu/workspace/universe/universe/envs/vnc_env.py", line 192, in _configure
      api_key=api_key,
    File "/home/ubuntu/workspace/universe/universe/remotes/build.py", line 19, in build
      n=n,
    File "/home/ubuntu/workspace/universe/universe/remotes/docker_remote.py", line 43, in __init__
      self._assigner = PortAssigner(reuse=reuse)
    File "/home/ubuntu/workspace/universe/universe/remotes/docker_remote.py", line 149, in __init__
      self.client, self.info = get_client()
    File "/home/ubuntu/workspace/universe/universe/remotes/docker_remote.py", line 143, in get_client
      return docker.Client(base_url=host, version=client_api_version), info
    File "/usr/local/lib/python2.7/dist-packages/docker/client.py", line 99, in __init__
      self._version = self._retrieve_server_version()
    File "/usr/local/lib/python2.7/dist-packages/docker/client.py", line 124, in _retrieve_server_version
      'Error while fetching server API version: {0}'.format(e)
  docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', error(2, 'No such file or directory'))
  </code></pre>