Mobile_WS_Controller not found - php

Question

Hi in the below php file I am calling in my android application but I am tried in postman am getting the below error.Using this url am accessing the login page but it is not working .No response from app
can any one please help me
Login.php:
<?php
class Mobile_WS_Login extends Mobile_WS_Controller {
function requireLogin() {
return false;
}
function process(Mobile_API_Request $request) {
$response = new Mobile_API_Response();
$username = $request->get('username');
$password = $request->get('password');
$current_user = CRMEntity::getInstance('Users');
$current_user->column_fields['user_name'] = $username;
if(vtlib_isModuleActive('Mobile') === false) {
$response->setError(1501, 'Service not available');
return $response;
}
if(!$current_user->doLogin($password)) {
$response->setError(1210, 'Authentication Failed');
} else {
// Start session now
$sessionid = Mobile_API_Session::init();
if($sessionid === false) {
echo "Session init failed $sessionid\n";
}
$current_user->id = $current_user->retrieve_user_id($username);
$current_user->retrieveCurrentUserInfoFromFile($current_user->id);
$this->setActiveUser($current_user);
$result = array();
$result['login'] = array(
'userid' => $current_user->id,
'crm_tz' => DateTimeField::getDBTimeZone(),
'user_tz' => $current_user->time_zone,
'user_currency' => $current_user->currency_code,
'session'=> $sessionid,
'vtiger_version' => Mobile_WS_Utils::getVtigerVersion(),
'date_format' => $current_user->date_format,
'mobile_module_version' => Mobile_WS_Utils::getVersion()
);
$response->setResult($result);
$this->postProcess($response);
}
return $response;
}
function postProcess(Mobile_API_Response $response) {
return $response;
}
}
Postman:
URL:http://XXXXXXX/modules/mobile/api/ws/Login.php
parms: username:abc
password:abc1
operation:login
Response From Postman:
<br />
<b>Fatal error</b>: Class 'Mobile_WS_Controller' not found in
<b>C:\xampp\htdocs\crmtest\modules\Mobile\api\ws\Login.php</b> on line
<b>10</b>
<br />