Fatal error: Uncaught Error: Interface "Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface" not found in C:\xampp\htdocs\londoncityroom\vendor\symfony\event-dispatcher\DependencyInjection\AddEventAliasesPass.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\londoncityroom\vendor\symfony\event-dispatcher\DependencyInjection\AddEventAliasesPass.php on line 22