FatalErrorException:Symfony2中的ParameterBag

I just installed Symfony2 in my local server using XAMPP, and fixed all the recommendation extensions- APC and intl. When I tried to access http://localhost/symblog/web/app_dev.php/. I got the following error.

FatalErrorException: Error: Class 'Symfony\Component\DependencyInjection\ParameterBag\ParameterBag' not found in /Applications/XAMPP/xamppfiles/htdocs/symblog/app/bootstrap.php.cache line 2469

I don't know what's wrong with it. I try to googling but It doesn't have any information. Any suggestion would be appreciated.

Seems like you cache is broken or dependencies are missing. Try:

php app/console cache:clear

If nothing changes, try:

php composer.phar install