ADS Momentum stopped why???

I was using ADS 2005A Momentum to simulate something. Yesterday everything worked fine. but momentum didn't work today. Even with the same project whick worked yesterday.

I got the following message:

port 4: mesher chose to use an analytical (approximating) formula to estimate the wavelength it need to determine the maximum cellsize.

and then Momentum simulation stopped

I tried many times and it didn't work.

it seems that the mesher is the problem, but I dont know what the problem is.

Maybe someone else also met this problem or I am the only "lucky" one?
I also attached the message, maybe someone could help.

Thanks a lot!