??? Error using ==> size Not enough input arguments.

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Hi,

I am using this code and getting size not enough input arguments can any one help me please. below is the code

   im = imread('cow.jpg'); 
  im = rgb2gray(im);
  dx = [-1, 0, 1; -2, 0, 2; -1, 0, 1];
  Ix = filter2(dx,im);
dy = [1, 2, 1; 0, 0, 0; -1, -2, -1];
Ix = filter2(dy,im);
Ix = conv2(double(im), dx, 'same');
Iy = conv2(double(im), dx, 'same');
g=fspecial('gaussian',[1 5],1.5);
% Step 2: Smooth space image derivatives (gaussian filtering)
Ix2 = conv2(Ix .^ 2, g, 'same');
Iy2 = conv2(Iy .^ 2, g, 'same');
Ixy = conv2(Ix .* Iy, g, 'same');
% Step 3: Harris corner measure
harris = (Ix2 .* Iy2 - Ixy .^ 2) ./ (Ix2 + Iy2);
% Step 4: Find local maxima (non maximum suppression)
mx = ordfilt2(harris, size.^ 2, ones(size));
% Step 5: Thresholding
harris = (harris == mx) & (harris >1000);
imshow(im);