Unrecognized function or variable n_subject

Why do I get this message and how to fix it? Thank you for your kind answers!

[Suphakson]

[Walter Roberson]

We would need the lines before that in cat_run.m

We might also need to see the line of code that is invoking cat_run

[Suphakson]

% $Id: cat_run.m 1984 2022-04-19 07:59:02Z gaser $

%#ok<*AGROW,*STRIFCND,*STRCL1,*ASGLU,*STREMP>

%rev = '$Rev: 1984 $';

% -----------------------------------------------------------------

% Lazy processing (expert feature)

% -----------------------------------------------------------------

% If N>10000 files were processed the crash of one of J jobs by

% small errors makes it hard to find the unprocess files.

% The lazy processing will only process files, if one of the output

% is missed and if the same preprocessing options were used before.

% -----------------------------------------------------------------

% disable parallel processing for only one subject

if n_subjects == 1, JOB.nproc = 0; end %#ok<STRNU,NODEF>

%{ send Matlab version to server

if cat_get_defaults('extopts.send_info')

urlinfo = sprintf('%s%s%s%s%s%s%d',cat_version,'%2F',computer,'%2F','processed',...

'%2F',n_subjects);

cat_io_send_to_server(urlinfo);

end

[Walter Roberson]

it appears to be a script that expects n_subjects to already have been assigned a value.