Dicom Image Registration Error?

when 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 somebody tell what happened ?

[Walter Roberson]

duplicates http://uk.mathworks.com/matlabcentral/answers/262289-matlab-tutorial-error