[lammps-users] request

hellow
i simulate a system with 100 toluene molecules
i must use of class2 in angle_style and dihedral_style in my simulation but it cause error (invlid angel_style or invalid dihedral_style)
if this eror may be beacuse of error in data file or in some package which are need for running of this class(class2)?
how i can solve this problem?
thanks

CLASS2 is an optional package. If you didn't build LAMMPS
with it, you can't use those commands.

Steve