Failed to start Rule-based Manager for Device Events and Files

I met this error on booting and closing the computer, why does it happen and how can I solve it?

[FAILED] Failed to start Rule-based Manager for Device Events and Files

You might have some odd rule in /etc/udev/rules.d/
have you checked that?

/etc/udev/rules.d/ is an empty folder now.

I edited fsck:

sudo vim /etc/mkinitcpio.conf

and changed udev to systemd:

HOOKS="base systemd autodetect modconf block keyboard keymap filesystems fsck"

It seems that this can solve the problem?

Are you asking me or your are telling me that you no longer get that error after making the change?

fsck can be run by systemd now … so yea, it can be removed from mkinitcpio HOOKS …

I never got error since then, but I still want to know if this is normal, as I didn’t do anything about /etc/udev/rules.d, it got this problem since I installed manjaro.