Texture Features using GLCM for extracting features of image

Hello,

I'm doing a project in classification of ultrasound kidney iamges. I used the program at

http://www.mathworks.com/matlabcentral/fileexchange/22187-glcm-texture-features/content/GLCM_Features1.m

i want to add ultrasound image and the program calculates the gray level co-occurrence matrix of the image

But an error is shwoing in the following lines

if ((nargin > 2) || (nargin == 0))

error('Too many or too few input arguments. Enter GLCM and pairs.');

do anyone know what should i change or add to the above code so that the error will not occur?