ERROR: Unknown command: download molecule then make import ask molecule txt (Forgot to uncomment line, fixed now)

LAMMPS
1

Hi all,

I’m using LAMMPS (2 Aug 2023 - Update 3) on a Macbook Air with an M2 silicon chip.
I ran into this error when working on my LAMMPS code. I was trying to introduce some SiO2 molecules to my H2O bulk. I was using the following lines of code:

molecule myMolecule SiO2mol.txt

create_atoms 0 random 10 12347 add_atoms mol myMolecule 12347 overlap 0.2 maxtry 50

However, when I ran it I got the ERROR: Unknown command: download molecule then make import ask molecule txt. Here is what my molecule .txt file looks like:

LAMMPS data file written by OVITO Basic 3.10.6

3 atoms
2 bonds
2 atom types
1 bond types

-2.5 1.215 xlo xhi
0.0 4.656515 ylo yhi
1.5 5.3 zlo zhi

Masses

1 15.9994 # O
2 28.085501 # Si

Atoms # full

2 1 2 0.0 -1.152 1.996 3.621
4 1 1 0.0 0.307 1.76 4.263
6 1 1 0.0 -1.087 3.111 2.453

Bonds

1 1 2 6
2 1 2 4

Any ideas in resolving this error will be appreciated. Thank you in advance, Vikentiy

2

Crisis averted. I looked through the documentation and found a sample file at this link: molecule command — LAMMPS documentation.

My file was formatted wrongly.

I apologise for wasting everybodies, but if this error were to occur to anyone else you know what to do now.

-V

3

The error you reported cannot be created by the molecule command. It looks more like you removed the pound sign (#) from a comment in the input file.

4

Thank you. You are absolutely right, I was taking notes and forgot to comment them out before running the simulation. Sorry for wasting your time