[lammps-users] illegal minimize command

That happens with both my lammps versions viz. 24Sept07 and 26Jun08
Since my minimizer minimizes energy from e8 to e2, does it mean that its
working fine, even if I am not including ftol in my arguments (and thus
making it only 3 arg input as written below) as needed?

I think so, yes. The syntax of the minimize command has changed from what it used to be. I know that when I've used a recent copy of LAMMPS (not sure if its the *most* recent version at the moment), using the old 3 arg input made it complain about "illegal minimize command," so I seem to have a mirror image of the problem that you have.

I'd recheck whether the 26Jun08 version has the same problem as the 24Sept07 version. That doesn't look right to me.