Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in C:\Apache24\htdocs\fixedasset\vendor\symfony\form\Extension\Validator\Constraints\Form.php:19 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\fixedasset\vendor\symfony\form\Extension\Validator\Constraints\Form.php on line 19