"'Vacuum' has no defaults" when ROOT read geometry written in GDML

From: Xinchun Tian <tianxc_at_gmail.com>
Date: Wed, 6 Apr 2011 12:41:15 -0400

Hi,

I defined "Vacuum" as following:

<materials>
<element Z="1" formula="Vacuum" name="videRef"> <atom value="1"/></element>
<material formula=" " name="Vacuum">

   <D value="1.e-25" unit="g/cc"/>
   <fraction n="1.0" ref="videRef"/>
</material>

    <volume name="vCornerCutoutExtruNDOSV">

      <materialref ref="Vacuum"/>
      <solidref ref="sCornerCutoutExtruNDOSV"/>

    </volume>

When ROOT read this geometry, I got "'Vacuum' has no defaults", what does that mean and how to solve it?

I also played with "Lead" which gives the same message.

Thanks,

Xinchun Received on Wed Apr 06 2011 - 18:41:23 CEST