[BUG]: Group analysis error

[DemianVera]

Homer3 1.58.0

Your environment (MATLAB environment and OS)

MATLAB Runtime 10, MATLAB R2017a; Windows 10 Pro 64-bit*

Description of the issue

Impossible to get the block averages for "Session", "Subject" or "Group". I can only compute the block averages for each run.

Steps to reproduce:
Open the test data folder. Select "Session", "Subject" or "Group" at the "Processing level" panel.
Expected behavior:
Block averages obtained for any of this processing level.

Actual behavior:

Matlab does not recognize the variable "fcalls". The error is the following:
Unrecognized function or variable 'fcalls'.
Error in ProcStreamClass/Calc (line 361)
obj.ExportProcStream(filename, fcalls);
Error in TreeNodeClass/Calc (line 1007)
fcalls = obj.procStream.Calc([obj.path, obj.GetOutputFilename()]); %#ok
Error in SessClass/Calc (line 343)
Calc@TreeNodeClass(obj);
Error in DataTreeClass/CalcCurrElem (line 789)
obj.currElem.Calc();
Error in MainGUI>pushbuttonCalcProcStream_Callback (line 593)
maingui.dataTree.CalcCurrElem();
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in MainGUI (line 21)
gui_mainfcn(gui_State, varargin{:});
Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)MainGUI('pushbuttonCalcProcStream_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback.

I have this issue since I updated to the last available version of Homer3.

Thanks for this amazing toolbox!