Fatal error: Uncaught Error: Interface 'Symfony\Component\Routing\Generator\Dumper\GeneratorDumperInterface' not found in /home/soh-works/www/websoket-sample/vendor/symfony/routing/Generator/Dumper/GeneratorDumper.php:21 Stack trace: #0 {main} thrown in /home/soh-works/www/websoket-sample/vendor/symfony/routing/Generator/Dumper/GeneratorDumper.php on line 21