Undefined function or variable 'untitled1_OutputFcn'. Error in gui_mainfcn (line 264) feval(gui_​State.gui_​OutputFcn, gui_hFigure, [], gui_Handles); Error in untitled1 (line 42) gui_mainfcn(gui_State, varargin{:});

The ERROR : Undefined function or variable 'untitled1_OutputFcn'.

Error in gui_mainfcn (line 264)

feval(gui_State.gui_OutputFcn, gui_hFigure, [], gui_Handles);

Error in untitled1 (line 42)

gui_mainfcn(gui_State, varargin{:});

This is my code

function varargout = untitled1(varargin)

% UNTITLED1 MATLAB code for untitled1.fig

% UNTITLED1, by itself, creates a new UNTITLED1 or raises the existing

% singleton*.

%

% H = UNTITLED1 returns the handle to a new UNTITLED1 or the handle to

% the existing singleton*.

%

% UNTITLED1('CALLBACK',hObject,eventData,handles,...) calls the local

% function named CALLBACK in UNTITLED1.M with the given input arguments.

%

% UNTITLED1('Property','Value',...) creates a new UNTITLED1 or raises the

% existing singleton*. Starting from the left, property value pairs are

% applied to the GUI before untitled1_OpeningFcn gets called. An

% unrecognized property name or invalid value makes property application

% stop. All inputs are passed to untitled1_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 untitled1

% Last Modified by GUIDE v2.5 13-Nov-2019 16:26:32

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

gui_State = struct('gui_Name', mfilename, ...

'gui_Singleton', gui_Singleton, ...

'gui_OpeningFcn', @untitled1_OpeningFcn, ...

'gui_OutputFcn', @untitled1_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

function untitled1_OpeningFcn(hObject, ~, 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 untitled1 (see VARARGIN)

%common parameters

handles.f=3.5; %Frequency band [GHz]

handles.pt=40; %transmitter power[dBm]

handles.pr=27; %Receiver power[dBm]

handles.n=6; %Noise figure [dBm]

handles.ht=5; %Transmitter antenna height(km)

handles.hr=0.005; %Receiver antenna height(km)

handles.Amu=20; %The median attenuation relative to free space

handles.gt=17; %Transmitter Antenna Gain [dBi]

handles.gr_s=15; %Receiver Antenna Gain [dBi] (stations)

handles.gr_h=2; %Receiver Antenna Gain [dBi] (handset)

handles.B=10; %Bandwidth [MHz]

handles.L=0.3; %Connector loss [dB]

handles.I=3; %Interference margin loss [dB]

handles.d=0:5:50; %The range of the distance between TX and RX

% Choose default command line output for untitled1

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% --- Executes just before untitled1 is made visible.

function Urban_Callback(~, ~, ~)

% hObject handle to Urban (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Okumura Propagation Model

Lf=32.44+20*log(f)+20*log(d); %Free Space Propagation Loss

Ght=20*log(ht/200); %Transmitter Antenna Height Gain Factor

if(hr<3) %Reciver Antenna Height Gain Factor

Ghr=20*log(hr/3);

else

Ghr=10*log(hr/3);

end

Garea=13;

L50=Lf+Amu-Ght-Ghr-Garea;

Rss= pt+gt+gr_s-L50-L;

SNIR= Rss/n+I;

c=B*log(1+SNIR);

throuput1=(c.*(B*log2(1+(10^(SNIR/10)))));

hold on;

figure (1)

axes(handles.axes1);

handles.axes1=min(0):max(50);

plot(d,L50,'LineWidth',1.5)

title('Okumura Model Analysis- Urban');

xlabel(' distance (Km)');

ylabel('Propagation Path loss(dB)');

% --- Executes on button press in Suburban.

function Suburban_Callback(~, ~, ~)

% hObject handle to Suburban (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% --- Executes on button press in Rural.

function Rural_Callback(~, ~, ~)

% hObject handle to Rural (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)