Symfony2 Can't inherit abstract function Validator\ValidatorInterface::validate() (previously declared abstract in \Validator\ValidatorInterface)
This error is the error message you get when running the new validator component in PHP 5.3.8 or older. You need to use at least PHP 5.3.9 to use recent versions of Symfony
The only way to solve this problem is to change ValidatorInterface or to run almost PHP 5.6