Reference to non-existent field error in a GUI

hello,

I was working with a GUI analyzing some videos for the past months and everything went ok. I re-installed MATLAB (R2013a, from a R2011 I think) and now I have some problem using the GUI:

I open the gui and want to load some frames. When I'm asked to type in the first file to load (lb) I get the error:

Reference to non-existent field 'lb_frame'.

Error in plotVisualizer>LoadData_Callback (line 4182) set(handles.lb_frame,'String',lb);

The code is:

 function LoadData_Callback(hObject, ~, handles)

str = {'Dance Data'};
[data_type,ok] = listdlg('PromptString','Select Data Type:', 'SelectionMode',...
  'single','ListString',str,'ListSize',[160 160]);
handles.data_type = data_type;
h = msgbox('Please indicate the range of configured data you would like to load');
uiwait(h);

lb = str2num(cell2mat(inputdlg('Please type the number of the first file to load')));
set(handles.lb_frame,'String',lb);
ub = str2num(cell2mat(inputdlg('Please type the number of the last file to load')));
set(handles.ub_frame,'String',ub);

 if data_type == 1
    old_dir = cd;

    location = uigetdir('','Please browse to Dance folder');
    addpath(location);
    cd(location);
    for n = lb:ub
    file =[num2str(n) '.dat']
    handles.dancedata{n} = importdata(file);
    end
    cd(old_dir);
end

 handles.lb = lb;
 handles.ub = ub;
 guidata(hObject,handles);

--- so basically I type in the frames I want and I want to load the corresponding files. This used to work ok, but now if I type 'handles' before

 lb = str2num(cell2mat(inputdlg('Please type the number of the first file to load')));  
   set(handles.lb_frame,'String',lb);

... I see that indeed lb_frame is not attached to the handles!

 handles = 

    data_type: 1

My callback function for lb_frame is there and the tag for lb_frame is ok.

Answer 1

[Image Analyst]

Everything sounds ok. No "clear" in there to erase handles, and you say there is a control called lb_frame, and yet when you type out handles immediately upon entering the function it's empty and only gets the data_type field after you assign that. So something's weird and I think you'll have to attach the fig file, and maybe the m-file for us to check out why handles is empty upon calling LoadData_Callback().

How are you calling it? You're not calling it directly from another function are you? You're calling it only upon clicking the button right? If you called it from a function and that function had a clear all in there, then it erased handles and will be empty upon entering LoadData_Callback().

[Doris]

I am calling it upon clicking a button, yes. Thanks, I think I need to re-install matlab. In case that doesn't work, I will send the .m and .fig files. But I suspect it will...