I am writing a very basic lammps script for simulation of lennard-jones fluid. The code I used is the following:
# Molecular Dynamics Simulation of a Lennard-Jones gas in 2D
# Initialization of Boundary
dimension 2
boundary p p p
# Units and Atomic information
units lj
atom_style atomic
# Simulation box setup and atom initialization
region box block 0 100 0 100 -5 5
create_box 1 box
create_atoms 1 random 100 345423 box
mass 1 2.0
labelmap clear
labelmap atom 1 gas-mol
# Potential definition
pair_style lj/cut 3
pair_coeff 1 1 1.0 1.0 2.5
# Velocity initialisation
velocity all create 1.0 25648
# Output Specifications
thermo 100
thermo_style custom step temp press etotal
# Simulation settings
neighbor 0.3 bin
neigh_modify delay 5
fix box all nve
timestep 0.003
#dump dynamics all movie 30 movie.mpg type type size 640 480
# Run
run 1000
However, the output shows up an error:
ERROR: Unknown command: labelmap clear (src/input.cpp:279)
I am not sure what is going wrong, and there is no unknown command error message in the lammps documentation as well. I tried checking the release pages of the newest version, but couldn't find anything on why this is the case. Any help is much appreciated.
