Error during "estimate surface models" in CAT12

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Hello,

I'm following CAT12 manual to estimate cortical thickness. I used the surface tool "resample and smooth surfaces" without any problem, so I have the resampled and smooth files named as "S15mm.mesh.thickness.resampled.name.gii". The next step says:

"Do not use the “Estimate” function in the SPM window, but rather use the respective function in CAT12. This allows to overlay your results automatically onto the Freesurfer average surface: CAT12 - Statistical Analysis - Estimate Surface Models".

But when I try to estimate surface models, it gives me the following error:

CAT default file:
  C:\spm12\toolbox\cat12\cat_defaults.m
Reference to non-existent field 'xY'.
Error in cat12>pushbutton5_Callback (line 180)
    if exist(fsavgDir,'dir') == 7 && SPM.xY.VY(1).dim(1) == 163842
Error in gui_mainfcn (line 96)
        feval(varargin{:});
Error in cat12 (line 76)
    gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)cat12('pushbutton5_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback