Incorrect args for pair coefficients for Airebo potential

I was trying to simulate the input file taken from lammps-users list.
I am getting an error : Incorrect args for pair coefficients (…/pair_airebo.cpp:161)
Can anyone help me out

Input file:

dimension 3
boundary p p p
newton on
units metal
atom_style atomic
read_data data.vmd50

pair_style airebo 3.0 1 1
pair_coeff * * CH.airebo C

Data file:
#Position data for Graphene

96 atoms

1 atom types

-1.84204 17.8063 xlo xhi
-0.709 12.053 ylo yhi
-50 50 zlo zhi

Masses
1 12.0

I was trying to simulate the input file taken from lammps-users list.
I am getting an error : Incorrect args for pair coefficients
(../pair_airebo.cpp:161)
Can anyone help me out

not with only half an input.
my best guess is that you have some UTF-8 characters in your input
that look like ASCII but are not. many modern web browsers do such
things.

axel.