Missing monitoring data for plugins: systemd_units_services

Hi everyone.
I’m trying to put a Linux service on our Linux monitoring, however, when i configure the rule and apply the changes, it appears the following message on some servers (CheckMK Check Output):

Missing monitoring data for plugins: systemd_units_services

Doing a review on CMK agen output, i find that the services are not listed, while in other server i can find all the services on the server.

Example:

<<<systemd_units>>>
[list-unit-files]
UNIT FILE STATE VENDOR PRESET
proc-sys-fs-binfmt_misc.automount static -
-.mount generated -
boot-efi.mount generated -
dev-hugepages.mount static -
dev-mqueue.mount static -
proc-sys-fs-binfmt_misc.mount disabled disabled

This systemd_units is not found on some servers.
I don’t know if there is a problem with the agent, because all the agents i reviewed are on 2.0.0p11 version.

How i can resolve this issue?
Thanks!