Check for incorrect argument

I am working for an Matlab GUI project using Arduino UNO. My plan for the project is that the Ultrasonic sensor will measuring distances from the sensor once I pressed the On button, and among other things. However, when I ran the program, the console outputs the error "Check for incorrect argument data type or missing argument in call to function 'ultrasonic'." at line 99. I followed the syntax in the documentation and the pins connected in the arduino are correct, so I was wondering where I went wrong in the code?

function varargout = GUI(varargin)
% GUI MATLAB code for GUI.fig
%      GUI, by itself, creates a new GUI or raises the existing
%      singleton*.
%
%      H = GUI returns the handle to a new GUI or the handle to
%      the existing singleton*.
%
%      GUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI.M with the given input arguments.
%
%      GUI('Property','Value',...) creates a new GUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before GUI_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to GUI_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

% Last Modified by GUIDE v2.5 19-Oct-2022 00:00:09

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @GUI_OpeningFcn, ...
                   'gui_OutputFcn',  @GUI_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 is made visible.
function GUI_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 (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = GUI_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;
delete(instrfind({'Port'},{'COM4'}))
clear a;
clear all;
global a;
a = arduino('COM4', 'Uno', "Libraries", "Ultrasonic");

%setting up pins of inputs and outputs (?)
configurePin(a, 'D11', 'Unset'); %ledBlue
configurePin(a, 'D10', 'Unset'); %ledYellow

configurePin(a, 'D4', 'Unset'); %reverseLeft
configurePin(a, 'D5', 'Unset'); %forwardLeft
configurePin(a, 'D6', 'Unset'); %reverseRight
configurePin(a, 'D7', 'Unset'); %forwardRight

% --- Executes on button press in turnOn.
function turnOn_Callback(hObject, eventdata, handles)
% hObject    handle to turnOn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
state = 1;
global a;

while (state==1)
    %start arduino IDE lines 29~35
    ultrasonicObj = ultrasonic(a, "D12", "D13");
    distCM = readDistance(ultrasonicObj)*100;
    disp(distCM);
    %end lines
    set(handles.textDist, 'string', distCM)
    %insert if-else and motor operation;
end


% --- Executes on button press in turnOff.
function turnOff_Callback(hObject, eventdata, handles)
% hObject    handle to turnOff (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
state = 0;
close all;
clear;
clc;

[Walter Roberson]

experiment with

   ultrasonicObj = ultrasonic(a, 'D12', 'D13');