Hi Dr. Spielberg,

Thank you for the fixed m-file. I have overwrote the "GTG_calcproperties_GUI.m" with new m-file  and I hit "start" button on the bottom. The he parallel pool will run for about 5 second, and then I receive an error message:

Undefined function or variable 'mod_grps'.

Error in GTG_calcproperties_GUI>Start_pushbutton_Callback
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in GTG_calcproperties_GUI (line 126)
gui_mainfcn(gui_State, varargin{:});
Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)GTG_calcproperties_GUI('Start_pushbutton_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback

It's the same error message have showed last time. 

Please let me know if you have any thoughts!

Thank you so much!
Edward