Very simple: Declaration of Drupal\untranslated_404\EventSubscriber\Untranslated404EventSubscriber::on404(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event) should be compatible with Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber::on404(Symfony\Component\HttpKernel\Event\ExceptionEvent $event) Untranslated404EventSubscriber.php:137
Issue fork untranslated_404-3249903
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Comment #5
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