Launching spectre from Matlab Error

Hello,

This issue is similar to this post located here:https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/40093/matlab-cds_srr-dc-sweep-of-mosfet-parametersI am trying to call spectre simulator from Matlab to do a dc-sweep by providing a configuration file such as the path, and the model files. 

To test script I ran the following script:

learvars;
close all;

% Load configuration
c = techsweep_config_psp_120_spectre% Write simulation parameters

fid=fopen('techsweep_params.scs', 'w');
fprintf(fid,'parameters length = %d\n', c.LENGTH(1));
fprintf(fid,'parameters sb = %d\n', c.VSB(1));
fclose(fid);

%Run simulator
system(c.simcmd);
[status,result] = system(c.simcmd);
if(status)
disp('Simulation did not run properly. Check techsweep.out.')
return;
end

% Echo simulator output variables
cds_srr(c.outfile, c.sweep)
cds_srr(c.outfile, c.sweep_noise)
idx1 = round(length(c.VGS)/2);
idx2 = round(length(c.VDS)/2);
s = sprintf('VGS = %d, VDS = %d', c.VGS(idx1), c.VDS(idx2));
disp(s)

% Initialize
for m = 1:length(c.outvars)
nch.(c.outvars{m}) = 0;
pch.(c.outvars{m}) = 0;
end

% Read and display raw parameters and created output
% nch
for k = 1:length(c.n)
params_n = c.n{k};
struct_n = cds_srr(c.outfile, c.sweep, params_n{1});
values_n = struct_n.(params_n{2});
s = sprintf('%s = %d', params_n{1}, values_n(idx1, idx2));
disp(s);
for m = 1:length(c.outvars)
nch.(c.outvars{m}) = nch.(c.outvars{m}) + values_n(idx1, idx2)*params_n{3}(m);
end
end
for k = 1:length(c.n_noise)
params_n = c.n_noise{k};
% note: using cds_innersrr since cds_srr is buggy for noise
struct_n = cds_innersrr(c.outfile, c.sweep_noise, params_n{1},0);
field_names = fieldnames(struct_n);
values_n = struct_n.(field_names{4});
s = sprintf('%s = %d', params_n{1}, values_n(idx1, idx2));
disp(s);
nch.(c.outvars_noise{k}) = values_n(idx1, idx2);
end
disp(nch);

% pch
for k = 1:length(c.p)
params_p = c.p{k};
struct_p = cds_srr(c.outfile, c.sweep, params_p{1});
values_p = struct_p.(params_p{2});
s = sprintf('%s = %d', params_p{1}, values_p(idx1, idx2));
disp(s);
for m = 1:length(c.outvars)
pch.(c.outvars{m}) = pch.(c.outvars{m}) + values_p(idx1, idx2)*params_p{3}(m);
end
end
for k = 1:length(c.p_noise)
params_p = c.p_noise{k};
% note: using cds_innersrr since cds_srr is buggy for noise
struct_p = cds_innersrr(c.outfile, c.sweep_noise, params_p{1},0);
field_names = fieldnames(struct_p);
values_p = struct_p.(field_names{4});
s = sprintf('%s = %d', params_p{1}, values_p(idx1, idx2));
disp(s);
pch.(c.outvars_noise{k}) = values_p(idx1, idx2);
end
disp(pch);

The loaded file, tc = techsweep_config_psp_120_spectre, has a line that goes like this,

c.simcmd = 'set path=($path /apps/cds/ic618/tools/bin); /apps/cds/spectre181/tools/bin/spectre techsweep.scs >! techsweep.out';

which is calling the spectre simulator and  I am getting the following error:

I am using IC6.1.8-64b.500.1 and spectre sub-version 18.1.0.235.isr3 and Matlab2018B.

What am I doing wrong? 

Thank you so much in advance.