index exceeds matrix dimensions: matlab

This is my code i get the error index matrix dimensions in this line:

network.meansqrerr {n} = plus( network.meansqrerr {n}, mse( network.error));|

the objectif of this line is sum of series of meansqrerr like symsum( but for quaternions)

for this line network.meansqrerrr {1} = [0 0 0 0 ] because my values are quaterionic and i need to itilialise it

function network = BUILD(inputs, targets, iterations)    
      %     regle pour determiner le noombre des neurones dans la couche caheée
  % source: stackoverflow 
      % Determiner  hidden neuroness ( dans la couche caché couche2) 
  %     round pour les virgules
      nhidden = round((size(inputs, 1) + size(targets, 1)) * 2 / 3);
  % %    
  %     fprintf(' le nombre des couches cachés est: ')
      disp(nhidden) ;

        % Create a neural network 
    %     on determine le nombre des  neurones dans chaque couche
    % couche1:  le nombre des entrées
    % couche 3 (output) le nombre des classe
       network = Create(size(inputs, 1), nhidden, size(targets, 1));
        % Iteration variables
  %     SOMME Des erreurs quadratique
      n = 1; 
        % Train network jusk le max des iterations
               %zeros_quat(zeros (10,1));
        while n <= iterations
          network.meansqrerr{1} = [ 0 0 0 0 ];
            % Training epoch
            % nombre des colonnes : size(inputs, 2)
            for i=1:size(inputs, 2)
                % Train network with inputs and target value
                network = traine(network, inputs(:,i), targets(:,i));
  %             % Update sum squared error
        network.meansqrerr {n} = plus(  network.meansqrerr {n}, mse( network.error));
     disp(['Iteration: ', num2str(n), ' / '    'Error: ',  num2str(double(network.meansqrerr{n})  )]);
    %          
    % 
    %         % afficher les erreurs dans chaque iteration
    %     disp(['Iteration: ', num2str(n), ' / '    'Error: ', num2str(network.meansqrerr(n) )]);
    % %            
  %             
            % Update iteration number
            n = n + 1;
        end
    %     afficher les poids
  end

[Walter Roberson]

I cannot proceed any further on this until you explain the difference between this question and your earlier http://www.mathworks.com/matlabcentral/answers/288632-index-exceeds-matrix-dimension