why am I getting this error:

Error using matlab.ui.control.UIControl/set
Invalid or deleted object.

Error in GUI>Start_Callback (line 184)
    set(handles.TrainText,'String','Loading Train Image # ');

my code is:

i = 1;
while (i<=numImage)

      %get(handles.TrainText,'String');
      set(handles.TrainText,'String','Loading Train Image # ');
      drawnow();
  %     set(handles.TrainText,'String','Loading Train Image # ');
  %     drawnow();
      disp(sprintf('Loading Train Image # %d',i));
      i=i+1;
  end

where TrainText is an edit text component.

[Geoff Hayes]

werad - is TrainText the name of the edit/text control? Are you sure that handles.TrainText is a valid handle to that control and that you have not overwritten it at any time in your code?

[Rik]

Have you closed the figure that contained this object? If so, you will have to recreate the handles (so saving the handles in a .mat file doesn't work).