set and get on two gui

I made two gui, gui A (input) and gui B (table), when I enter data into gui B, the data is lost and only appear later in case of error, so I need your advice

??? Error using ==> setappdata Invalid object handle

Error in ==> gui_mainfcn at 242 setappdata(gui_hFigure,'GUIOnScreen', 1);

Error in ==> main at 40 [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});

Error in ==> inputmaterial>okbutton_Callback at 77 mainGUIhandle = main;

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> inputmaterial at 16 gui_mainfcn(gui_State, varargin{:});

my code

function okbutton_Callback(hObject, eventdata, handles)
% hObject handle to okbutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
mainGUIhandle = main;
mainGUIdata = guidata(mainGUIhandle);
inputmaterial=get(handles.applybutton,'UserData')
set(mainGUIdata.table1,'data',inputmaterial)
guidata(main, mainGUIdata);
close

Answer 1

[Paulo Silva]

The error is in the line:

mainGUIhandle = main;

In that context MATLAB doesn't know what the variable main is because it's not defined, maybe you can use:

mainGUIhandle = gcf;

or

mainGUIhandle = handles.figure1;