How to fix this error?? --> Error using ==> or Matrix dimensions must agree.

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[namafile, formatfile] = uigetfile({'*.png','*.jpg'}, 'membuka gambar'); %memilih gambar
image = imread([formatfile, namafile]); %membaca gambar
guidata(hObject, handles)
axes(handles.axes1); %memilih axes1 sebagai letak gambar yang dimunculkan
imshow(rgb2gray(image));%memunculkan gambar
image = GLCM(image)
tab(:,1)= [image(1,1) image(1,2) image(1,3) image(1,4) ]';
tab(:,2)= [image(1,5) image(1,6) image(1,7) image(1,8) ]';
tab(:,3)= [image(1,9) image(1,10) image(1,11) image(1,12) ]';
tab(:,4)= [image(1,13) image(1,14) image(1,15) image(1,16) ]';
tab(:,5)= [image(1,17) image(1,18) image(1,19) image(1,20) ]';
  set(handles.uitable1, 'Data', tab);
 
training1 = xlsread('hasilsemua','Training1');
group = training1(:,23);
training = [training1(:,1) training1(:,2) training1(:,3) training1(:,4) training1(:,5) training1(:,6) training1(:,7) training1(:,8) training1(:,9) training1(:,10) training1(:,11) training1(:,12) training1(:,13) training1(:,14) training1(:,15) training1(:,16) training1(:,17) training1(:,18) training1(:,19) training1(:,20)];
hasil1=knnclassify(image,training,group);

if hasil1==1
    x='Kelas 3';
elseif hasil1==2
    x='Kelas 4';
end
set(handles.edit2,'string',x);

pixel_dist = str2double(get(handles.edit1,'string'));
[glcm,SI] =  graycomatrix(image,'Offset',[0 pixel_distance; -pixel_distance pixeldistance; -pixel_distance 0; -pixel_distance -pixel_distance]);

i will put pixel distance function in GLCM program, but i have some problem :

I hope i can fix this problem as soon as possible, plese help me, thanks.

??? Error using ==> or
Matrix dimensions must agree.

Error in ==> graycomatrix>computeGLCM at 233
bad = isnan(v1) | isnan(v2);

Error in ==> graycomatrix at 196
    GLCMS(:,:,k) = computeGLCM(r,c,Offset(k,:),SI,NL);

Error in ==> cobaGUI>pushbutton1_Callback at 108
[glcm,SI] =  graycomatrix(image,'Offset',offsets);

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

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

Error in ==>
@(hObject,eventdata)cobaGUI('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

 
??? Error while evaluating uicontrol Callback

[Walter Roberson]

image = GLCM(image)

GLCM is not a Mathworks supplied routine, and we do not know how it will handle when you pass in RGB images. We know from the line before,

imshow(rgb2gray(image));%memunculkan gambar

that you are expecting image to be RGB.