Error using horzcat

[ymcasky]

Hi, I use the image from
https://github.com/manan180796/Spectral-Remapping-for-Image-Downscaling -> source1.jpg
then run main Script

>> image = imread('D:\code\downsample\Spectral-Remapping-for-Image-Downscaling\source1.jpg');
>> [ result ] = mainScript( double(image),2,1 );

It show error in Realign (line 13) o = [o,0]; with error message
Error using horzcat
Dimensions of arrays being concatenated are not consistent.

Can you tell me how to fix it?
Thanks!