|Message: "'Vacuum' has no defaults" when ROOT read geometry written in GDML||Not Logged In (login)|
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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?