Constructing boron nitride nanotube polymer composite

Hi,

I tried to incorporate boron nitride nanotube with polymer using amorphous module but it couldn't assign forcefilelds for all atoms (using compass). I found literature that this polymer with BN nanotube has be run in forcite module using "universal forcefield". There is a universal.off file in share folder but amorphous module does not recognize the ".off" file except the ".frc" file when I tried to use amorphous module with universal forcefield. I would appreciate if anybody please help me to know if there is any solution to incorporate BN nanotube with polymer. 

Thanks in advance

Mumin