Wavelet analysis error message

[Florent43]

Hi there,

I have just started using the Acycle Matlab version software and have been learning my way through it with the "Example #2: La2004 astronomical solution (ETP)" from the manual guide.

I am stuck at Step 6 where I can't perform the Wavelet analysis on the LR04.

I get the following error message on MATLAB:

Key parameters updated/changed. Re-run wavelet : done
Unrecognized function or variable 'fmin'.
Error in chisquare_inv (line 36)
X = fmin('chisquare_solve',MINN,MAXX,[0,TOLERANCE],P,V);
Error in wave_signif (line 145)
chisquare = chisquare_inv(siglvl,dof(a1))/dof(a1);
Error in wave_readGUI (line 137)
global_signif = wave_signif(variance,dt,scale,1,lag1,-1,dof,mother,param);
Error in waveletGUI>waveletGUI_OpeningFcn (line 436)
wave_readGUI
Error in gui_mainfcn (line 220)
feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure), varargin{:});
Error in waveletGUI (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in AC>menu_waveletGUI_Callback (line 8607)
waveletGUI(handles);
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in AC (line 92)
gui_mainfcn(gui_State, varargin{:});
Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)AC('menu_waveletGUI_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating Menu Callback.

Can anyone help me figure out what I need to do?

Many thanks,
Florent