Error message when submitting forum posts

After posting a new topic to the Wireless Networking forum, I got a nasty PHP error (below). The post seems to have gone through, but the error caused me to think it hadn’t and re-try many times. Is anybody else seeing this?

[code:t4momajc]Fatal error: Uncaught exception ‘Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException’ with message ‘You have requested a non-existent service "notification.method.board".’ in /www/forum.mikrotik.com/html_315/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:802 Stack trace: #0 /www/forum.mikrotik.com/html_315/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(444): Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition(‘notification.me...’) #1 /www/forum.mikrotik.com/html_315/phpbb/notification/manager.php(907): Symfony\Component\DependencyInjection\ContainerBuilder->get(‘notification.me...’) #2 /www/forum.mikrotik.com/html_315/phpbb/notification/manager.php(899): phpbb\notification\manager->load_object(‘notification.me...’) #3 /www/forum.mikrotik.com/html_315/phpbb/notification/manager.php(461): phpbb\notification\manager->get_method_class(‘notification.me...’) #4 /www/forum.mikrotik.com/html_315/p in /www/forum.mikrotik.com/html_315/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 802[/code:t4momajc]

We migrated the server. Make sure your DNS is pointing forum.mikrotik.com to it’s correct IP 159.148.147.205 and that you clear the browser and proxy caches.

I have same problem.. and also page not display correctly.
Untitled-1.jpg

Same answer as before. This theme only existed on old server