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Keep getting "Material is not defined" error while all of my materials are fully defined

Question asked by Josh Ferguson on Nov 8, 2011
Latest reply on Jan 15, 2012 by John Countz

Trying to run a Frequency analysis, but every time I try to run it, I get this error.

 

All of my materials are fully defined.  I have triple checked them and the required fields highlighted in red all have the correct data. 

 

Can anyone help?  Thanks in advance.

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