Critical Error On this website

To solve the cause of the error, you should take a look at the error log of your hosting. There you should be able to see what the cause is. Maybe it is a plugin that is no longer compatible with something after an update.

Alternatively to the error log you can also activate the debugging in WordPress to find the cause: https://www.ads-software.com/support/article/debugging-in-wordpress/

If you have no success with this, you can also deactivate all plugins. How to do that without accessing the backend is described here: https://www.ads-software.com/support/article/faq-troubleshooting/#how-to-deactivate-all-plugins-when-not-able-to-access-the-administrative-menus