securityPlugin problem on ubuntu

Hi Guys i used invo securityplugin in my project and it works fine when i run it on xampp but after uploading code on linux ubuntu i get this error

Fatal error: Uncaught Error: Class 'SecurityPlugin' not found in /var/www/html/master/app/config/services.php:24 Stack trace: #0 [internal function]: Closure->{closure}() #1 [internal function]: Phalcon\Di\Service->resolve(NULL, Object(Phalcon\Di\FactoryDefault)) #2 [internal function]: Phalcon\Di->get('dispatcher', NULL) #3 [internal function]: Phalcon\Di->getShared('dispatcher') #4 /var/www/html/master/public/index.php(42): Phalcon\Mvc\Application->handle() #5 {main} thrown in /var/www/html/master/app/config/services.php on line 24

and it's not permision problem, projects witout securityplugin work fine

all folder and files are 777

services.php

<?php

use Phalcon\Mvc\View;
use Phalcon\Mvc\View\Engine\Php as PhpEngine;
use Phalcon\Mvc\Url as UrlResolver;
use Phalcon\Mvc\View\Engine\Volt as VoltEngine;
use Phalcon\Mvc\Model\Metadata\Memory as MetaDataAdapter;
use Phalcon\Session\Adapter\Files as SessionAdapter;
use Phalcon\Flash\Direct as Flash;
use Phalcon\Mvc\Dispatcher;
use Phalcon\Events\Manager as EventManager;
/**
 * Assign Plugins To Dispatcher
 */
$di->setShared('config', function () {
    return include APP_PATH . "/config/config.php";
});
$di->set(
    "dispatcher",
    function () {
        $eventManager = new EventManager();
        $eventManager->attach(
            "dispatch:beforeDispatch",
            new SecurityPlugin()
        );
        $dispatcher = new Dispatcher();
        $dispatcher->setEventsManager($eventManager);
        return $dispatcher;
    }
);

/**
 * Shared configuration service
 */
$di->setShared('config', function () {
    return include APP_PATH . "/config/config.php";
});

.
.
.

loader.php

<?php

$loader = new \Phalcon\Loader();

/**
 * We're a registering a set of directories taken from the configuration file
 */
$loader->registerDirs(
    [
        $config->application->controllersDir,
        $config->application->modelsDir,
        $config->application->libraryDir,
        $config->application->pluginsDir,
    ]
)->register();

config.php

<?php

defined('BASE_PATH') || define('BASE_PATH', getenv('BASE_PATH') ?: realpath(dirname(__FILE__) . '/../..'));
defined('APP_PATH') || define('APP_PATH', BASE_PATH . '/app');

return new \Phalcon\Config([
    'database' => [
        'adapter'     => 'Mysql',
        'host'        => 'localhost',
        'username'    => 'root',
        'password'    => '',
        'dbname'      => 'master',
        'charset'     => 'utf8',
    ],
    'application' => [
        'appDir'         => APP_PATH . '/',
        'controllersDir' => APP_PATH . '/controllers/',
        'modelsDir'      => APP_PATH . '/models/',
        'migrationsDir'  => APP_PATH . '/migrations/',
        'viewsDir'       => APP_PATH . '/views/',
        'pluginsDir'     => APP_PATH . '/plugins/',
        'libraryDir'     => APP_PATH . '/library/',
        'cacheDir'       => BASE_PATH . '/cache/',
        'baseUri'        => preg_replace('/public([\/\\\\])index.php$/', '', $_SERVER["PHP_SELF"]),
    ]
]);