Pair coeff for hybrid has invalid style

LAMMPS LAMMPS Beginners
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1

Hi,

I am using the following commands for pair style and air coefficents in my input script -

########################POTENTIAL PARAMETER########################
pair_style hybrid sw lj/cut/coul/long 12.0
pair_modify mix arithmetic
bond_style harmonic
angle_style harmonic
dihedral_style opls
kspace_style pppm 1.0e-5
#kspace_modify slab 3.0
My potential parameter as following：

Si-Si interactions (sw potential)

pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL
pair_coeff * * Si.sw Si NULL

Water-water interactions (Lennard-Jones)

pair_coeff 9 9 lj/cut/coul/long 0.046000 0.400014
pair_coeff 10 10 lj/cut/coul/long 0.152100 3.150574
pair_coeff 11 11 lj/cut/coul/long 0.024000 2.387609
pair_coeff 12 12 lj/cut/coul/long 0.046000 0.400014
pair_coeff 13 13 lj/cut/coul/long 0.078000 3.652685
pair_coeff 14 14 lj/cut/coul/long 0.192100 3.144872
pair_coeff 15 15 lj/cut/coul/long 0.066000 3.500000
pair_coeff 16 16 lj/cut/coul/long 0.053000 2.950000
pair_coeff 17 17 lj/cut/coul/long 0.140000 2.900000
But when I run the input script it is showing -
ERROR: Pair coeff for hybrid has invalid style (src/pair_hybrid.cpp:469)
Last command: pair_coeff * * Si.sw Si NULL

Can anyone tell me how to solve it? Thanks in advance.

Regards,
Arya

2

All the explanations are in the LAMMPS manual.
Please also study the forum guidelines to learn how to properly format your post and which information to provide.

BTW: you must be using an outdated LAMMPS version, because the error message you should be getting is:

ERROR: Expected hybrid sub-style instead of Si.sw in pair_coeff command (src/pair_hybrid.cpp:530)
Last command: pair_coeff * * Si.sw Si NULL