Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Definition\Exception\Exception' not found in /home/app/htdocs/ninja/vendor/symfony/config/Definition/Exception/InvalidConfigurationException.php:20
Stack trace:
#0 {main}
thrown in /home/app/htdocs/ninja/vendor/symfony/config/Definition/Exception/InvalidConfigurationException.php on line 20