GUi error

[wtj0906]

Hi,
My matlab version is R2016b.

addpath /home/gretna2/GRETNA-master
gretna;
%when I push 'Network Analysis' button
Undefined function or variable 'gretna_GUI_NetAnalysisInterface'.

Error in gretna>CalButton_Callback (line 103)
gretna_GUI_NetAnalysisInterface;

Error in gui_mainfcn (line 95)
feval(varargin{:});

Error in gretna (line 42)
gui_mainfcn(gui_State, varargin{:});

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gretna('CalButton_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback
Thanks.