slicing flag with parfor, cannot identify error

MatLab flagged an error in my parfor loop. The error is roughly 'valid indices are restricted in parfor loops'. Have read the sliced variables documentation and cannot determine the problem. Similar code and my attempted diagnosis follow.

N=10;
M=20;

DTc = zeros(M,2,2);
DTcs1 = zeros(M,N);
DTcs2 = zeros(M,N);

parfor kIter = 1:M
    DT = eye(2);
    DTs = reshape(repmat(eye(2),[N,1]),[N,2,2]);
     
    DTc(kIter,:,:) = DT; %flagged
    DTcs1(kIter,:) = DTs(:,1,1); %flagged
    DTcs2(kIter,:) = DTs(:,2,2); %flagged
end

I read the documentation and DTc, DTcs1 and DTcs2 seem to fit the four characteristics of sliced variables.

[Huy Dinh]

Also posted this on stackoverflow.

[Jeremy]

Your code runs for me with no errors. Do you have the parallel computing toolbox?

[Huy Dinh]

I believe so. I have been able to run code with parfor loops. Not sure if parallel computing toolbox is required to run parfor loops.

[Huy Dinh]

Just removed the flag by retyping the code. I'm confused.