Thanks for your comment.
The problem is not the level of error reporting but that the website will not display.
It has a white screen with error message "The website encountered an unexpected error. Please try again later."
The issue happened after I enabled Monster Menus.
Did not work for me on drupal 10.
Here is my error message;
[Thu Mar 02 14:03:14.920093 2023] [fcgid:warn] [pid 47185:tid
3606329603840] [client 66.33.200.4:26881] mod_fcgid: stderr: PHP Fatal
error: Declaration of
Drupal\\monster_menus\\Routing\\RouteSubscriber::getSubscribedEvents()
must be compatible with
Drupal\\Core\\Routing\\RouteSubscriberBase::getSubscribedEvents(): array
in
/home/nzuko/nzukoanambra.org/modules/monster_menus/src/Routing/RouteSubscriber.php
on line 30