Error on working code!

[ImtiazShuvo]

Unable to resolve the name rfdata.data.

Error in ReadCalKitSNP (line 7)
SL_obj=read(rfdata.data, [handles.CalKitDir,LineFile{i}]);

Error in main>StartCalObj_Callback (line 217)
handles=ReadCalKitSNP(handles);

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

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

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)main('StartCalObj_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

main
Unable to resolve the name rfdata.data.

Error in ReadCalKitSNP (line 7)
SL_obj=read(rfdata.data, [handles.CalKitDir,LineFile{i}]);

Error in main>StartCalObj_Callback (line 217)
handles=ReadCalKitSNP(handles);

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

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

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)main('StartCalObj_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.