title: Python, cannot use geometry manager pack inside
body: <p>I am having several errors after the installation of Anaconda. 
  When I run a program I get the message: </p>
  
  <pre><code>TclError: cannot use geometry manager pack inside . which already has slaves managed by grid
  </code></pre>
  
  <p>The program was written using Python 3.3. The Anaconda version is for 3.4. But I don't think there were any syntax differences between 3.3 and 3.4.
  I searched and could not find any solution for this error.
  I don't even know what it means.</p>
  
  <p>Thank you.</p>