[lammps-users] airebo

I have tried to run a simulation using AIREBO potential
but got some errors.
I noted that using "units metal" it never worked, but the same
input file with "units real" worked fine. My problem is that the
Manual of Lammps says it is parameterized only to "metal" units.
How to obtain the correct parameterization for "real" units ?

Here I put a copy of the input file: