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Problem with masses Se and Sn atoms in forcefield

Hi guys, 

I need to make a simulation with SeSn crystal. I have just selected for this crystal Universal forcefield. Universal has mass number for Se and Sn, but there are not their masses. So, my simulation failed because the masses of these atoms are zero and the system does not calculate properties for zero-mass atoms.
At this point, How can I modify the properties, such as mass, of these atoms in the force field? 
CarstenCarsten (Accelrys) 
Which Materials Studio version do you use?
Could you please close all Windows of that run and then zip and post the complete directory of that run?