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Warning in solid element definition

Hi guys, I'm a very beginner user of radioss. I tried to model an honeycomb impact attenuator in Hypercrash following the 'Crash Box-Tutorial'. When I run the model in Radioss I obtaine the following warning:
'** WARNING IN SOLID ELEMENT DEFINITION
DESCRIPTION :CHANGED CONNECTIVITY OF 3D ELEMENT ID=4101 TO AVOID NEGATIVE VOLUME'
Then the simulation stops after only 1 cycle.

I followed also the advice in this discussion (http://forum.altairhyperworks.com/index.php?/topic/18360-negative-volume/), but nothing to do. 
Some of you could explain me which is the problem? I uploaded the model.
Thank you very much.
Andrea.

 

 

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