Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Reference" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/dependency-injection/TypedReference.php:19 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/dependency-injection/TypedReference.php on line 19