matlab 错误使用feval_遇到了难题！ feval(varargin{:});错误，急求高手帮助！

我设置了一个open image的按钮，然后响应的程序设计为

function OpenImg_Callback(hObject, eventdata, handles)

% hObject    handle to OpenImg (see GCBO)

% eventdata  reserved - to be defined in a future version of MATLAB

% handles    structure with handles and user data (see GUIDATA)

handles.SI=figure(1);

% Get file name

[FileName,PathName] = uigetfile('*.*','Select Image');

if (FileName)==0

return

end

enableButtons(handles);

FullPathName = [PathName,'\',FileName];

%read in image and get size

rgbX = imread(FullPathName);

handles.rgbX = double(rgbX)/255;

handles.X = (handles.rgbX);

handles.dispX=handles.X;

[handles.Orows handles.Ocols handles.Odim]=size(handles.X);

[handles.rows handles.cols handles.dim]=size(handles.X);

handles.E=findEnergy(handles.X);    %Finds the gradient image

handles.dispE=handles.E;

handles.dispS=zeros(handles.rows, handles.cols);

iptsetpref('ImshowBorder','tight')  %removes figure broder

ImagePlot(handles);

guidata(hObject,handles);

return;

可是当我运行该按钮时，可以打开文件夹。但是选择文件夹中的图像打开时，弹出的figure窗口是空白的，看不到图像，而且commmand 窗口中显示错误为：

Error in ==> SeamCutGUI>enableButtons at 426

set(handles.Reset,'Enable','on');

Error in ==> SeamCutGUI>OpenImg_Callback at 468

enableButtons(handles);

Error in ==> gui_mainfcn at 75

feval(varargin{:});

Error in ==> SeamCutGUI at 46

gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

到底是怎么回事？问题出在哪里了呢？我该怎样修改呢？求高手赐教！！！