Hi, I'm new to matlab. I try to load a graph to gui but keep getting these error after click the push button. I'm using matlab 2015b.

function varargout = gui_meditation(varargin)
% GUI_MEDITATION MATLAB code for gui_meditation.fig
%      GUI_MEDITATION, by itself, creates a new GUI_MEDITATION or raises the existing
%      singleton*.
%
%      H = GUI_MEDITATION returns the handle to a new GUI_MEDITATION or the handle to
%      the existing singleton*.
%
%      GUI_MEDITATION('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI_MEDITATION.M with the given input arguments.
%
%      GUI_MEDITATION('Property','Value',...) creates a new GUI_MEDITATION or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before gui_meditation_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to gui_meditation_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help gui_meditation

% Last Modified by GUIDE v2.5 21-Nov-2017 22:41:35

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @gui_meditation_OpeningFcn, ...
                   'gui_OutputFcn',  @gui_meditation_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before gui_meditation is made visible.
function gui_meditation_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to gui_meditation (see VARARGIN)

% Choose default command line output for gui_meditation
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes gui_meditation wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = gui_meditation_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in Start.
function Start_Callback(hObject, eventdata, handles)
% hObject    handle to Start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

function varargout = gui_meditation(varargin)
% GUI_MEDITATION MATLAB code for gui_meditation.fig
%      GUI_MEDITATION, by itself, creates a new GUI_MEDITATION or raises the existing
%      singleton*.
%
%      H = GUI_MEDITATION returns the handle to a new GUI_MEDITATION or the handle to
%      the existing singleton*.
%
%      GUI_MEDITATION('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI_MEDITATION.M with the given input arguments.
%
%      GUI_MEDITATION('Property','Value',...) creates a new GUI_MEDITATION or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before gui_meditation_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to gui_meditation_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help gui_meditation

% Last Modified by GUIDE v2.5 07-Nov-2017 00:02:16

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @gui_meditation_OpeningFcn, ...
                   'gui_OutputFcn',  @gui_meditation_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before gui_meditation is made visible.
function gui_meditation_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to gui_meditation (see VARARGIN)

% Choose default command line output for gui_meditation
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes gui_meditation wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.
function varargout = gui_meditation_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

%Clear Screen
clc;
%Clear Variables
clear all;
%Close figures
close all;
%Preallocate buffer
data_med = zeros(1,256);
%Comport Selection
portnum1 = 5;
%COM Port #
comPortName1 = sprintf('\\\\.\\COM%d', portnum1);
% Baud rate for use with TG_Connect() and TG_SetBaudrate().
TG_BAUD_115200 = 115200;
% Data format for use with TG_Connect() and TG_SetDataFormat().
TG_STREAM_PACKETS = 0;
% Data type that can be requested from TG_GetValue().
TG_DATA_MEDITATION = 3;
%load thinkgear dll
loadlibrary('Thinkgear.dll');
%To display in Command Window
fprintf('Thinkgear.dll loaded\n');
%get dll version
dllVersion = calllib('Thinkgear', 'TG_GetDriverVersion');
%To display in command window
fprintf('ThinkGear DLL version: %d\n', dllVersion );
% Get a connection ID handle to ThinkGear
connectionId1 = calllib('Thinkgear', 'TG_GetNewConnectionId');
if ( connectionId1 < 0 )
error( sprintf( 'ERROR: TG_GetNewConnectionId() returned %d.\n', connectionId1 ) );
end;
% Attempt to connect the connection ID handle to serial port "COM3"
errCode = calllib('Thinkgear', 'TG_Connect', connectionId1,comPortName1,TG_BAUD_115200,TG_STREAM_PACKETS );
if ( errCode < 0 )
error( sprintf( 'ERROR: TG_Connect() returned %d.\n', errCode ) );
end
fprintf( 'Connected. Reading Packets...\n' );
i=0;
j=0;
%To display in Command Window
disp('Reading Brainwaves');
figure;
while i < 20
if (calllib('Thinkgear','TG_ReadPackets',connectionId1,1) == 1) %if a packet was read...
if (calllib('Thinkgear','TG_GetValueStatus',connectionId1,TG_DATA_MEDITATION ) ~= 0)
j = j + 1;
i = i + 1;
%Read attention Valus from thinkgear packets
data_med(j) = calllib('Thinkgear','TG_GetValue',connectionId1,TG_DATA_MEDITATION );
%To display in Command Window
disp(data_med(j));
%Plot Graph
plot(data_med);
title('Meditation');
%Delay to display graph
pause(1);
end
end
end
%To display in Command Window
disp('Loop Completed')
%Release the comm port
calllib('Thinkgear', 'TG_FreeConnection', connectionId1 );

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

...............................

these errors appear.

>> gui_meditation
Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_meditation('edit1_CreateFcn',hObject,eventdata,guidata(hObject)) 
Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_meditation('Start_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

>> matlab.graphics.internal.figfile.FigFile.read
The class matlab.graphics.internal.figfile.FigFile has no Constant property or Static method named 'read'.

>> gui_meditation
Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

>> gui_meditation
Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_meditation('Start_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_meditation('Start_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

Error: File: gui_meditation.m Line: 83 Column: 22
Function with duplicate name "gui_meditation" cannot be defined.

Error in
matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_meditation('Start_Callback',hObject,eventdata,guidata(hObject)) 
Error while evaluating UIControl Callback

>>

Answer 1

[Walter Roberson]

Delete everything up to line 82, the line before the second "function gui_meditation"

[Muhamad Hakimie Husin]

I already deleted everything up to line 82 but still, come up with the same error. Btw thank you for a reply.