Fatal error: Uncaught Error: Class 'Symfony\Component\VarExporter\Internal\Hydrator' not found in C:\xampp\htdocs\ITI\uvdesk\vendor\symfony\var-exporter\Tests\Fixtures\serializable.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ITI\uvdesk\vendor\symfony\var-exporter\Tests\Fixtures\serializable.php on line 3