Failed to connect to MySQL: (1045) Access denied for user 'root'@'localhost' (using password: NO)

can you help me here i have site and i am using one form to take customer data and send to the zoho via API v1 but now i want to upgrade to the API v2 so i followed by php SDK and i follow this url to create user https://www.zoho.com/crm/developer/docs/php-sdk/organization-sample.html?src=create_user

and i used this below code

<?php

include 'zoho-sdk/vendor/autoload.php';

use zcrmsdk\crm\setup\restclient\ZCRMRestClient;

use zcrmsdk\crm\setup\users\ZCRMProfile;

use zcrmsdk\crm\setup\users\ZCRMRole;

use zcrmsdk\crm\setup\users\ZCRMUser;

class Org{

public function __construct()

{

$configuration = array("client_id"=>"","client_secret"=>"","redirect_uri"=>"","currentUserEmail"=>"");

ZCRMRestClient::initialize($configuration);

}

public function createUser(){

$orgIns = ZCRMRestClient::getOrganizationInstance(); // to get the organization instance

$user=ZCRMUser::getInstance(NULL, NULL);//to get the user instance

$user->setLastName("subject");//to set the last name of the user

$user->setFirstName("test");//to set the first name of the user

$user->setEmail("");//to set the email id of the user

$role=ZCRMRole::getInstance("{role_id}","{role_name}");//to get the role

$user->setRole($role);//to get the role of the user

$profile=ZCRMProfile::getInstance("{profile_id}","{profile_name}");//to get the profile

$user->setProfile($profile);//to set the profile of the user

$responseIns=$orgIns->createUser($user);//to create the user

echo "HTTP Status Code:".$responseIns->getHttpStatusCode(); //To get http response code

echo "Status:".$responseIns->getStatus(); //To get response status

echo "Message:".$responseIns->getMessage(); //To get response message

echo "Code:".$responseIns->getCode(); //To get status code

echo "Details:".json_encode($responseIns->getDetails());

}

$obj = new Org();

$obj->createUser();

but it give me this error ==> Failed to connect to MySQL: (1045) Access denied for user 'root'@'localhost' (using password: NO)

can you help me to integrate with API v2.