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None "'Vacuum' has no defaults" when ROOT read geometry written in GDML 

Forum: Geometry
Date: 06 Apr, 2011
From: Xinchun Tian <Xinchun Tian>

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>

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

Thanks, Xinchun

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