Error in DPARSFA

Hi, we are using your toolbox DPARSFA (v4.2) with matlab R2014b

We followed the tutorial concerning the folder structure.
We selected  this parameters  :

When we compute the data, we have the following error message :

Moving Head Motion Corrected Files:Sub4 OKMoving Head Motion Corrected Files:Sub3 OKMoving Head Motion Corrected Files:Sub2 OKMoving Head Motion Corrected Files:Sub1 OK
Undefined function 'y_Read' for input arguments of type 'char'.

Error in y_FD_Jenkinson (line 31)
[RefData, RefHead] = y_Read(ReferenceImage,1);

Error in DPARSFA_run (line 892)
            FD_Jenkinson = y_FD_Jenkinson(rpname.name,RefFile);


Error in DPARSFA>pushbuttonRun_Callback (line 1783)
    [Error]=DPARSFA_run(handles.Cfg);


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

Error in DPARSFA (line 30)
    gui_mainfcn(gui_State, varargin{:});

 
Error while evaluating UIControl CallbackMoving Head Motion Corrected Files:Sub4 OKMoving Head Motion Corrected Files:Sub3 OKMoving Head Motion Corrected Files:Sub2 OKMoving Head Motion Corrected Files:Sub1 OK
Undefined function 'y_Read' for input arguments of type 'char'.

Error in y_FD_Jenkinson (line 31)
[RefData, RefHead] = y_Read(ReferenceImage,1);

Error in DPARSFA_run (line 892)
            FD_Jenkinson = y_FD_Jenkinson(rpname.name,RefFile);


Error in DPARSFA>pushbuttonRun_Callback (line 1783)
    [Error]=DPARSFA_run(handles.Cfg);


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

Error in DPARSFA (line 30)
    gui_mainfcn(gui_State, varargin{:});

 
Error while evaluating UIControl Callback

Thanks for your help

Best regards

Paul H.