parfor, not classified variable, again

Why is K_tmp not classified?

   K_tmp = zeros(1,nt);
   parfor K = 1:nt
        ## unimportant codes
        ##
        if ~isempty(find(tissuedistrib(X1:X2,Y1:Y2,Z1:Z2)-t(end,K)==0))&&(local_refined_times<=max_refine_time)
            K_tmp(:,K) = 1;