Matlab Tutorial Error?

wneh im run this tutorial http://in.mathworks.com/help/images/registering-multimodal-mri-images.html#zmw57dd0e13337

Im getting this error after this codes

movingRegisteredAffineWithIC = imregister(moving,fixed,'affine',optimizer,metric,...
    'InitialTransformation',tformSimilarity);

This is the error

Error using imregtform>parseInputs (line 240)
Parameters must be a character.

Error in imregtform (line 119)
parsedInputs = parseInputs(varargin{:});

Error in imregister (line 115)
tform = imregtform(varargin{:});

can sombody tell what happened ?

[Image Analyst]

Can you make it easy for us by attaching the m-file. That web page doesn't seem to have it all as one contiguous block of code but it's scattered all over the place.