Index exceeds matrix dimensions - MATLAB GUI

In my GUI shown below <http://s1273.photobucket.com/user/Chethan_tv/media/CBIR_zpsb48bce14.jpg.html>

open push button is used to view image displayed on respective axes. axes display an image, open buttons should display the corresponding image in bigger size.

    %below 3 lines are in GUI *_opening function
    handles.MyData.ListFileName = 'FileName';
    handles.MyData.FileNames = {}; % here we store all the image names
    handles.MyData.Images = {}; % here we store all images

below code is in display_results function

    function displayResults(filename,hObject, eventdata, handles)
    fid=fopen(handles.MyData.ListFileName);
        for N=6:1:10
            imagename = fgetl(fid);
            if ~ischar(imagename), break, end       % Meaning: End of File...
            [x,map]=imread(imagename);
            rgb=ind2rgb(x,map);
            ax = handles.(sprintf('axes%d', N));
            image(rgb, 'Parent', ax);
            set(ax, 'Visible','off');
            %xlabel(imagename);

            % store file name and image itself for later use
            handles.MyData.Images{N} = rgb;
            handles.MyData.FileNames{N} = imagename;

            % we have buttons like open1 open2 open3 etc...
            % add some info to the open buttons
            % so they will be aware which image they display
            btn = handles.(sprintf('open%d', N));
            set(btn, 'UserData',N);
        end
        fclose(fid);
        % Update handles structure
        guidata(hObject, handles);

My open pushbutton function is

    function open1_Callback(hObject, eventdata, handles)
    % hObject    handle to open1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)

    N   = get(hObject,'UserData');
    rgb = handles.MyData.Images{N};
    ax  = handles.(sprintf('axes%d', N));
    % create figure in 'modal' mode, so user have to close it to continue
    figure('WindowStyle','modal', 'Name',handles.MyData.FileNames{N} );
    % show image
    image(rgb, 'Parent', ax);
    set(ax, 'Visible','off');
    guidata(hObject, handles);

but when i press open button which is below axes6, i'm getting error like

    ??? Index exceeds matrix dimensions.

    Error in ==> Fig5>open6_Callback at 163
    rgb = handles.MyData.Images{N};

    Error in ==> gui_mainfcn at 96
            feval(varargin{:});

    Error in ==> Fig5 at 42
        gui_mainfcn(gui_State, varargin{:});

    Error in ==>         @(hObject,eventdata)Fig5('open6_Callback',hObject,eventdata,guidata(hObject))

       ??? Error while evaluating uicontrol Callback

Which part of my code is wrong?