Fatal error: Uncaught Error: Class "Symfony\Component\Cache\Adapter\AbstractAdapter" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\cache\Adapter\MemcachedAdapter.php:23 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\cache\Adapter\MemcachedAdapter.php on line 23