Error when I reset my interface ?

I have clear button that reset all interface component so I can start new operation without needing to close and open the interface here is the clear button code

set(handles.impsnr,'String','');
arrayfun(@cla,findall(0,'type','axes'))

the error is

Error in wmark_e>inp_Callback (line 137)
 set(handles.msg,'Enable','on')

Because I make all Enabled button is OFF Except the first button then when the user click the first button the second button will be changed to on and so on whenever I click on clear button to start new operation the previous error appears could any one help ?

[Walter Roberson]

Please show the complete error message, everything in red.

[Eliza]

here is the full code include the error

img=imread([path,fname]);
  [x y dim]=size(img);

    if length(size(img))>2
        if dim==4
    img(:,:,4) = [];
    end
        img=rgb2gray(img);
    end
    axes(handles.iim); imshow(img);
    title('Orignal Image')
    handles.img=img;
   set(handles.msg,'Enable','on')

[Eliza]

here is the error message

Error using set
Invalid handle

Error in wmark_e>inp_Callback (line 137)
 set(handles.msg,'Enable','on')

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

Error in wmark_e (line 43)
    gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)wmark_e('inp_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

[Walter Roberson]

Whatever handles.msg is at that point is not the handle to a graphics object. At the command line command

dbstop if error

and run your code. When it stops, examine to see what handles.msg is.

[Eliza]

set(handles.msg,'Enable','on')

[Eliza]

this is the exact error .This code aims to enable the next button .Because I make it disabled as default

[Walter Roberson]

Please show the output of

class(handles.msg)

[Eliza]

ans =

uint8

[Eliza]

I just have an idea to solve this problem by putting if condition to ensure this line of command will not be executed except if the default state of the button is off but there is an error also

if handles.msg.Enable=='off'