why am I getting this error:

werad saoud

2018 3 26

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更新时间：2021 8 20

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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.

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Geoff Hayes 2018-3-26

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 2018-3-26

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).

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