Fatal error: Uncaught Error: Class 'Symfony\Component\Form\AbstractExtension' not found in C:\Apache24\htdocs\fixedasset\vendor\symfony\form\Extension\Core\CoreExtension.php:29 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\fixedasset\vendor\symfony\form\Extension\Core\CoreExtension.php on line 29