Warning: Error creating or updating Line

Hi everyone

I´m practicing in matlab R2019 with this excercise:

https://la.mathworks.com/videos/arduino-with-matlab-and-simulink-part-2-programming-arduino-uno-with-matlab-99405.html

When I run the code, the LED turns on depending on the LDR values, but if I push the button the graph does not appear, and the Command Window displays the next warnings:

> In defaulterrorcallback (line 12)

In asyncio/Stream/wait (line 183)

In asyncio/OutputStream/drain (line 205)

In matlabshared.transportlib.internal.asyncIOTransportChannel/AsyncIOTransportChannel/write

In matlabshared.seriallib.internal/Serial/write

In matlabshared.transportclients.internal.IOServerClient/IOServerBlockClient/write

In matlabshared.ioclient/IOProtocol/commandResponse

In matlabshared.ioclient/IOProtocol/rawRead

In matlabshared.ioclient.peripherals/AnalogInput/readResultAnalogInSingleInternal

In matlabshared.devicedrivers/AnalogInSingle/readAnalogInResult

In arduino/readVoltageHook (line 929)

In matlabshared.adc/master/readVoltage (line 56)

In p7 (line 68)

Warning: Error creating or updating Line

Error in value of one or more of the following properties: XData YData

Array is wrong shape or size

> In defaulterrorcallback (line 12)

In asyncio/Stream/wait (line 183)

In asyncio/OutputStream/drain (line 205)

In matlabshared.transportlib.internal.asyncIOTransportChannel/AsyncIOTransportChannel/write

In matlabshared.seriallib.internal/Serial/write

In matlabshared.transportclients.internal.IOServerClient/IOServerBlockClient/write

In matlabshared.ioclient/IOProtocol/commandResponse

In matlabshared.ioclient/IOProtocol/rawRead

In matlabshared.ioclient.peripherals/DigitalIO/readDigitalPinInternal

In matlabshared.devicedrivers/DigitalIO/readDigitalIO

In matlabshared.dio/master/readDigitalPinHook (line 151)

In matlabshared.dio/master/readDigitalPin (line 75)

In p7 (line 61)

Warning: Error creating or updating Line

Error in value of one or more of the following properties: XData YData

Array is wrong shape or size

> In defaulterrorcallback (line 12)

In asyncio/Stream/wait (line 183)

In asyncio/OutputStream/drain (line 205)

In matlabshared.transportlib.internal.asyncIOTransportChannel/AsyncIOTransportChannel/write

In matlabshared.seriallib.internal/Serial/write

In matlabshared.transportclients.internal.IOServerClient/IOServerBlockClient/write

In matlabshared.ioclient/IOProtocol/commandResponse

In matlabshared.ioclient/IOProtocol/rawWrite

In matlabshared.ioclient.peripherals/DigitalIO/writeDigitalPinInternal

In matlabshared.devicedrivers/DigitalIO/writeDigitalIO

In matlabshared.dio/master/writeDigitalPinHook (line 160)

In matlabshared.dio/master/writeDigitalPin (line 104)

In p7 (line 77)

Warning: Error creating or updating Line

Error in value of one or more of the following properties: XData YData

Array is wrong shape or size

How can I correct this "error" to make the graph of voltage appears?

Thanks for you help.

%%p7.m
%Excercise 2 
%Según la intensidad de luz en el ambiente dependerá la intensidad de
%brillo del LED.
%A mayor intensidad de luz, menor brillo del LED.
%A menor intensidad de luz, mayor brillo del LED.
%Fotoresistencia conectada al PIN 0('D0') del Arduino Uno. LDR connected to PIN 0
%Botón conectado al PIN 3 ('D3') del Arduino Uno. Button connected to PIN 3
%LED conectado al PIN 11 ('D11') del Arduino Uno. LED connected to PIN 11

%%
%%Inicializamos Objetos logicos del Arduino y asignamos Pines
clear all;
close all;
clc;

Port = 'COM9';
minutesToRunDemo = 0.5;

%Eliminamos las conexiones existentes al puerto asignado al ArduinoUno.
delete(instrfind({'Port'},{Port}))
a = arduino('COM9','Uno');

%% Asignamos entradas digitales al ArduinoUno
buttonPin = 'D3'; %Pin3 'D3'
ledPin = 'D11';   %Pin11 'D11'

%% Fotoresistencia
lightSensorPin = 'D0'; %Pin0 'D0'

%%
%%Grafica

h = plot(nan,nan,'r');
hAxes = h.Parent;
hAxes.Title.String = 'Luminosidad del ambiente';
hAxes.YGrid = 'on';
hAxes.YLim = [0,1];
drawnow;

%% Adquisisción de los datos desde ArduinoUno

disp(['La ejecución se realizará durante ', num2str(minutesToRunDemo*60), ' seconds.']);
disp('Presiona el botón para cambiar el estado (On/Off) e inciar la captura de información...');

lightValue = NaN;
obs = 1;

writePWMDutyCycle(a,'D11',0);

% Inicializamos el estado del botón en Off 
buttonState = 0; % buttonState == 0, no se capta información.
                 % buttonState == 1, se captura información.

% Leemos el estado actual del botón
%%previousButtonState = readDigitalPin(a,buttonPin);
previousButtonState = readDigitalPin(a,'D3');
tic
while toc/60 < minutesToRunDemo
    %%currentButtonState = readingDigitalPin(a,buttonPin);
    currentButtonState = readDigitalPin(a,'D3'); %% LINE 61 WARNING
    if currentButtonState == 1 && previousButtonState == 0
        buttonState = mod(buttonState+1,2);
    end
    
    if buttonState == 1
        %%lightValue = readVoltage(a,lightSensorPin);
        lightValue = readVoltage(a,'A0'); %% LINE 68 WARNING  
        %%writePWMDutyCycle(a,ledPin,(5-lightVlue)/5);
        writePWMDutyCycle(a,'D11',(5-lightValue)/5);
    end
    
    if buttonState == 0
        lightValue = nan;
        if currentButtonState == 1 
            %%writeDigitalPin(a,ledPin,1);
            writeDigitalPin(a,'D11',1); %% LINE 77 WARNING
        else
            %%writeDigitalPin(a,ledPin,0);
            writeDigitalPin(a,'D11',0);
        end
    end
    
    % Actualizamos la grafica    
      h.XData = [h.XData,obs];    
end