Problem with assigning properties to object array in class

Why I got error message for following code and how can I fix it? Thanks...

ObjArray.m: clear all; clc

A= {'a',2;'V',3};

Obj = ObjArrayClass(A);

ObjArrayClass.m:

classdef ObjArrayClass properties c1 c2 end

    methods
        function Obj = ObjArrayClass(A)
%             Obj = struct; % Doest not help
%             Obj = cell(size(A),1); % Doest not help            
%             size(A,1)
            for iRow=1:size(A,1)
                Obj(iRow).c1 = A(iRow,1);
                Obj(iRow).c2 = A(iRow,2);
            end
        end
    end
end

Answer 1

[J. Hu]

After adding following like in http://www.mathworks.com/help/matlab/matlab_oop/creating-object-arrays.html:

if nargin ~= 0 % Allow nargin == 0 syntax

end

then it works. Why? It does not change anything. Strange.