Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Dumper\Dumper' not found in /home/app/htdocs/ninja/vendor/symfony/dependency-injection/Dumper/GraphvizDumper.php:31
Stack trace:
#0 {main}
thrown in /home/app/htdocs/ninja/vendor/symfony/dependency-injection/Dumper/GraphvizDumper.php on line 31