Problem with semiconductor device simulation using COMSOL version 4.0

Hi,

I am new to comsol.
I am trying to learn how to use comsol version 4.0.
Since I am interested in semiconductor devices simulation, I downloaded two models ( mos_transistor and semiconductor_diode) which are written in version 3.5a.
Everything is ok except that I couldn't plot the IV characteristics.
It looks like there is a problem with evaluating the Lagrange multipliers lm2 and lm3.

The help file is not that helpful for a new user.

Does someone know how to solve this problem?

Thanks

YC