MATLAB: REFERENCE TO NON-EXISTENT FIELD ‘labelList’

reference to non-existent field

Matlab is generating the 'reference to non-existent field' error for my code. As below there is the error in my code.
Reference to non-existent field 'labelList'. Error in innalillah>draw_Callback (line 156) num = get(handles.labelList,'Value');
function draw_Callback(hObject, eventdata, handles)
% hObject    handle to draw (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
images = getappdata(0, 'images');
method = getappdata(0, 'method');
img = getappdata(0, 'img');
num = get(handles.labelList,'Value'); %Reference to non-existent field 'labelList'.
buf = [];
if method == 3
  axes(handles.imgArea);
  hold on;
  h = imshow(img);
  replot_seeds(handles);
  hold off;
  e = imfreehand(gca);
  mask = uint8(createMask(e, h));
  switch num
    case 1
      buf = mask;
      if isempty(images.regionOne)
        images.regionOne = buf;
      else
        [xx, yy] = find(buf == num);
        for n = 1:length(xx)
          images.regionOne(xx(n), yy(n)) = num;
        end
      end
    case 2
      buf = mask * num;
      if isempty(images.regionTwo)
        images.regionTwo = buf;
      else
        [xx, yy] = find(buf == 2);
        for n = 1:length(xx)
          images.regionTwo(xx(n), yy(n)) = num;
        end
      end
    case 3
      buf = mask * num;
      if isempty(images.regionThree)
        images.regionThree = buf;
      else
        [xx, yy] = find(buf == 3);
        for n = 1:length(xx)
          images.regionThree(xx(n), yy(n)) = 3;
        end
      end
    case 4
      buf = mask * num;
      if isempty(images.regionFour)
        images.regionFour = buf;
      else
        [xx, yy] = find(buf == num);
        for n = 1:length(xx)
          images.regionFour(xx(n), yy(n)) = num;
        end
      end
    case 5
      buf = mask * num;
      if isempty(images.regionFive)
        images.regionFive = buf;
      else
        [xx, yy] = find(buf == num);
        for n = 1:length(xx)
          images.regionFive(xx(n), yy(n)) = num;
        end
      end
  end
  setappdata(0, 'images', images);
  replot_seeds(handles);
else
  [~,xpts,ypts] = freehanddraw(handles.imgArea,'color',handles.LST{num},'linewidth', 2);
  buf=[xpts,ypts];
  buf = (floor(buf));
  buf(end + 1, :) = NaN;
  switch num
    case 1
      if isempty(images.labelOne)
        images.labelOne = buf;
      else
        label = images.labelOne;
        images.labelOne = double([label;buf]);
      end
    case 2
      if isempty(images.labelTwo)
        images.labelTwo = buf;
      else
        label = images.labelTwo;
        images.labelTwo = double([label;buf]);
      end
    case 3
      if isempty(images.labelThree)
        images.labelThree = buf;
      else
        label = images.labelThree;
                images.labelThree = double([label;buf]);      
end
    case 4
      if isempty(images.labelFour)
        images.labelFour = buf;
      else
        label = images.labelFour;
        images.labelFour = double([label;buf]);
      end
    case 5
      if isempty(images.labelFive)
        images.labelFive = buf;
      else
        label = images.labelFive;
        images.labelFive = double([label;buf]);
      end
    otherwise
  end
end
assignin('base', 'buf', buf);
setappdata(0, 'images', images);
%guidata(gcbo,handles);

Best Answer

We as outside viewers have no reason to expect that handles.labelList will exist.
You appear to be using GUIDE, and it appears that you are expecting handles.labelList to be the handle of a uicontrol style 'listbox'. Perhaps you have a typing mistake in the name of the control -- for example perhaps it is handles.label_List or handles.labellist . Or perhaps it used to be handles.labelList but you renamed it.
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