Using Lammps to figure out melting point of Cu-Ni and getting error "Incorrect args for pair coefficients (src/MANYBODY/pair_eam_alloy.cpp:51)"

LAMMPS LAMMPS Beginners
1

I am currently working with lammps to find the melting point of Cu-Ni and continue to get the error of “Incorrect args for pair coefficients (src/MANYBODY/pair_eam_alloy.cpp:51)”

I am new to Lammps and am trying to figure out why this error is here, can someone please help?

My input code is as follow:

------------------------ INITIALIZATION ----------------------------

units metal
dimension 3
boundary p p p
atom_style atomic

----------------------- ATOM DEFINITION ----------------------------

lattice fcc 3.520
region box block 0 10 0 10 0 10
create_box 1 box
create_atoms 1 box

------------------------ FORCE FIELDS ------------------------------

pair_style eam/alloy
pair_coeff * * CuNi_v2.eam.alloy

------------------------- SETTINGS ---------------------------------

neighbor 0.3 bin
neigh_modify every 10 delay 0 check yes

thermo 2000

fix 1 all npt 0.01 0.01 1.00 xyz 0.0 0.0 1.0 drag 0.2
run 50000
unfix 1

thermo 2000

fix 1 all npt 0.01 0.85 2.0 xyz 0.0 0.0 1.0 drag 2.0

run 1000000

######################################

SIMULATION DONE

print “All done”

2

As a person new to LAMMPS you should take advantage of one of its great advantages: a large and detailed documentation. You get the error you quote because you do not provide any information about which element to map to which atom type. Details are in the documentation for the eam pair style.