Hi JC,<br><br>It looks like the problem is coming up when the Pressure field asks for the ThermalEnergy field.  If you try region[&#39;ThermalEnergy&#39;], does that work?  If not, please also try region[&#39;TotalEnergy&#39;] and region[&#39;GasEnergy&#39;].<br>
<br>Britton<br><br><div class="gmail_quote">On Mon, Jun 27, 2011 at 6:19 PM, Jean-Claude Passy <span dir="ltr">&lt;<a href="mailto:jcpassy@gmail.com">jcpassy@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<u></u>

  

    
  
  <div bgcolor="#ffffff" text="#000000">
    Hi all,<br>
    <br>
    I must be doing something silly because I get a weird error when
    trying to access the &#39;Pressure&#39; field of a region:<br>
    <br>
    <address>---------------------------------</address>
    <address>TypeError: unsupported operand type(s) for *=: &#39;NoneType&#39;
      and &#39;float&#39;</address>
    ---------------------------------<br>
    <br>
    It works fine with &#39;Density&#39;, &#39;x-velocity&#39;, &#39;x&#39;, ... I have pasted
    the complete output error here
    <a href="http://paste.enzotools.org/show/7up5l2Q3Rc8nnLZA3VKu" target="_blank">http://paste.enzotools.org/show/7up5l2Q3Rc8nnLZA3VKu</a><br>
    Has anyone ever encountered that ?<br>
    <br>
    Thanks a lot,<br><font color="#888888">
    <br>
    JC<br>
    </font><br>
    <br>
    PS: I really like the new home page of the yt website. Congrats !<br>
  </div>

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