title: getting error distributionNotFound
body: <p>I have installed celeryD and redis on my system. when i am running the command using <code>celery</code>. iam getting the following error.</p>
  
  <pre><code>  Traceback (most recent call last):
    File "/usr/local/bin/celeryd", line 5, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2711, in &lt;module&gt;
      parse_requirements(__requires__), Environment()
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 584, in resolve
      raise DistributionNotFound(req)
  pkg_resources.DistributionNotFound: python-dateutil&gt;=1.5,&lt;2.0
  </code></pre>
  
  <p>what may be the possible reason??</p>