VAT problem: Ref. to non-existent field ‘vatsettings_horn_removeElectrode’

Hi,
when attempting to visualize VAT for St.Jude directed 6172 (short) electrodes from within the Stimulation window, I encountered the following problem:

...
Region 40 captured by insulating material.
8 components with 362278 tetraeders total assigned to tissue type 1.
1 components with 444030 tetraeders total assigned to tissue type 2.
9 components with 56653 tetraeders total assigned to tissue type 3.
22 components with 303205 tetraeders total assigned to tissue type 4.
 Done. (30.8912 s)
Creating volume conductor...
 Completed percentage of this task indicated by dots
 0---10---20---30---40---50---60---70---80---90--100
  Done. (12.4489 s)
Calculating voltage distribution...
 Done. (9.7689 s)
Calculating E-Field...
 Done. (0.5443 s)
Calculating quiver field of gradient for display purposes...
Reference to non-existent field 'vatsettings_horn_removeElectrode'.

Error in ea_genvat_horn (line 400)
if options.prefs.machine.vatsettings_horn_removeElectrode

Error in ea_stimparams>stimulate_Callback (line 993)
            [stimparams(1,side).VAT(el).VAT,volume]=feval(ea_genvat,elstruct(el).coords_mm,getappdata(handles.stimfig,'S'),side,options,stimname,options.prefs.machine.vatsettings.horn_ethresh,handles.stimfig);

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

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

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

I’m running LeadDBS 2.3 with the default settings.

Any ideas, please?

cheers,
Tomas