Problem using fitfc

I am using ATAT to do harmonic phonon calculations on FCC metals to determine self-diffusion coefficients.
I have been following my advisor’s instructions on setting up the files to run the calculations. Both my advisor and I have run into a issue. When I attempt to use the command fitfc to generate mt Vol files it either returns a list of commands that can be run or it returns "Segmentation fault (core dumped)". My advisor and I have tried all different variants on the command to no luck. the files I currently have in my directory are as follows.

CONTCAR dos.out energy felecparam fitfcparam force.out hessian.out INCAR KPOINTS OSZICAR OUTCAR param POSCAR POTCAR script stress.out str.out str_relax.out vasp.in vasp.wrap vasp.wrap.relax vasp.wrap.static

I am more than happy to show anyone who can assist with this issue the contents of files that would help diagnose the problem. I believe the problem lies in the files as my advisor also installed ATAT on her profile and ran into the same issues.

Thanks in advance for your help.

Sorry for the delay - we’d need your input files: str.out and the command you used to be able to reproduce the problem.

I have figured out what was the cause of the problem I was having. I generate the str.out files using the extract_vasp command. The next step is to generate the Vol_* folders via the fitfc command. The problem arises from the fact that my str.out file does not name the atom species at the end of each line. I do self diffusion in metals so I have never really had to worry about labeling my atoms in my poscar. My new question is where is extract_vasp looking for the atom species to write to the str.out files so i can make sure that my files are made correctly without having to edit them for atom species by hand?

Thanks in advance for your help!