Language in OCR function is not working

I am using Matlab R2014a? I done my code to extract the words using in a image using ocr function. it works fine in Engish. but for Tamil language, eventhough u download tam.traineddata, it produce an error message as Subscript indices must either be real positive integers or logicals.

Error in ocr>getLanguageInfo (line 464) lang{i} = params.Language{i}(indexStart(end):indexEnd(end));

Error in ocr>parseParams (line 393) [tessdata, lang] = getLanguageInfo(params);

Error in ocr>tesseract (line 130) tessOpts = parseParams(params);

Error in ocr (line 114) [rawtext, metadata] = tesseract(params, img, roi, hasROI);

Error in main>WordReg_Callback (line 132) txt = ocr(grayImage, 'Language', ...

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in main (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)main('WordReg_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

in the code

 txt = ocr(grayImage, 'Language', ...
               {'eng.traineddata',...
                'tam.traineddata'});
Pleas help to solve this problem