Path issue during including file in PHP.

Warning: require_once(../DB/DBConnect.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\ShivLMSNew\API\insertUser.php on line 3

Fatal error: Uncaught Error: Failed opening required '../DB/DBConnect.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\ShivLMSNew\API\insertUser.php:3 Stack trace: #0 C:\xampp\htdocs\ShivLMSNew\signup.php(5): include_once() #1 {main} thrown in C:\xampp\htdocs\ShivLMSNew\API\insertUser.php on line 3

<?php

require_once '../DB/DBConnect.php';
$db=new DBConnect();
$pdoObj=$db->connectToDB();

$response=array();

if($_POST['radioUserType'] AND $_POST['txtUserName'] AND $_POST['txtEmail'] AND $_POST['txtMobile'] AND $_POST['txtPassword1'] AND $_POST['txtPassword2'])
{
    include_once ('../Classes/SanitizerClass.php');
   
    $userType = $_POST['radioUserType'];
    $userName =SanitizerClass::sanitizeUsername($_POST['txtUserName']);
    $email = SanitizerClass::sanitizeEmail($_POST['txtEmail']);
    $mobile=trim($_POST['txtMobile']);
    $plain_password=$_POST['txtPassword1'];
    $encrypted_password = password_hash($plain_password,PASSWORD_BCRYPT);
    $pwd2=$_POST['txtPassword2'];
    $isEmailVerified="NotVerified";
    $generated_activationCode = md5(uniqid(rand()).time());
    $dateRegistered=date('d-m-Y');
    $ip=crud::getVisitorIP();

    include_once '../inc/crud.php';
    list($CountryName,$CityName,$ContinentName,$CurrencySymbol,$CurrencyCode,$TimeZone)=CRUD::getVisitorsDetails($ip);//here 47.9.193.174 should be changed to $ip

    
    include_once '../Classes/User.php';  
    $user=new User();

    $isEmailAlreadyTakenBySomeone= $user->isEmailAlreadyTakenBySomeone($email);
    if($isEmailAlreadyTakenBySomeone==true)
    {
        $response['error'] = true;
        $response['message'] = "Registration failed. Someone has already registered with the same email.";
    }
    else
    {
        $isEmailHasValidFormat = $user->isEmailHasValidFormat($email);
        if($isEmailHasValidFormat==true)
        {
            $stmt = $conn->prepare("INSERT INTO tbl_users(userType,userName,email,mobile,password,isEmailVerified,activationCode,dateRegistered,ipAddress,countryName,cityName,continent,currencySymbol,currencyCode,timeZone) 
            VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");
            $stmt->bind_param("sssssssssssssss",$userType,$userName,$email,$mobile,$encrypted_password,$isEmailVerified,$generated_activationCode,$dateRegistered,$ip,$CountryName,$CityName,$ContinentName,$CurrencySymbol,$CurrencyCode,$TimeZone);
            if($stmt->execute() == TRUE)
            {
                $response['error'] = false;
                $response['message'] = "User registered successfully!";
            } 
            else
            {
                $response['error'] = true;
                $response['message'] = "failed\n ".$conn->error;
            }
        }
        else
        {
            $response['error'] = true;
            $response['message'] = "Error in registering. Invalid Email Format.";
        }

    }
} 
else
{
    $response['error'] = true;
    $response['message'] = "All fields are not filled";
}
echo json_encode($response);