title: Error on installing packages on python
body: <p>I tried to install pandas on my cmd and this is the output</p>
  
  <pre><code>Requirement already satisfied: pandas in c:\users\name\anaconda3\lib\site-packages (0.23.0)
  Requirement already satisfied: python-dateutil&gt;=2.5.0 in c:\users\name\anaconda3\lib\site-packages (from pandas) (2.7.3)
  Requirement already satisfied: pytz&gt;=2011k in c:\users\name\anaconda3\lib\site-packages (from pandas) (2018.4)
  Requirement already satisfied: numpy&gt;=1.9.0 in c:\users\name\anaconda3\lib\site-packages (from pandas) (1.14.3)
  Requirement already satisfied: six&gt;=1.5 in c:\users\name\anaconda3\lib\site-packages (from python-dateutil&gt;=2.5.0-&gt;pandas) (1.11.0)
  
  **distributed 1.21.8 requires msgpack, which is not installed.**
  </code></pre>
  
  <p>This last line is in red.</p>
  
  <p>Im on windows 10, I installed anaconda</p>