[ODE] ODE Message 2: vector has zero size in dNormalize4()

[dvir schirman]

Hi

I'm running a simulation of a robot at ODE.
My robot is made out of three rectangular boxes connected with two hinges.
My simulation is working. But, when I run it I get the following message
repeatedly:

"ODE Message 2: vector has zero size in dNormalize4()"

What does this message means?
What effect would it have on the result of my simulation?
How it effects the efficiency of my simulation?

I'm using Cygwin g++ 3.4.4.

Thanks for your help,
Dvir
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