Hi @augus,
You’re more likely to get relevant help by providing the LAMMPS version you are using and following the forum guidelines.
At the moment it is hard to tell what goes wrong without more info. Are you sure you copied the requested files in the directory where you execute your script and that no invisible characters are in your pair_coeff line?
This asides, I don’t think the following set of commands does what you think it does:
region box block 0 144.77 0 145.02 0 145.02
lattice bcc 3.0
create_box 2 box
create_atoms 1 box
create_atoms 2 box
You’re likely to get other errors once you solve the pair_coeff issue.