Arch Linux

Description:NetworkManager.service is filling the log with error message. It can't really be called flooding but there are plenty of entries in there:

###journalctl excerpt ###
Nov 07 22:07:45 ARCHTEST dbus[370]: [system] Activating via systemd: service name='org.freedesktop.NetworkManager' unit='dbus-org.freedesktop.NetworkManager.service'
Nov 07 22:07:45 ARCHTEST dbus[370]: [system] Activation via systemd failed for unit 'dbus-org.freedesktop.NetworkManager.service': Unit dbus-org.freedesktop.NetworkManager.service failed to load: No such file or directory. See system logs and 'systemctl status dbus-org.freedesktop.NetworkManager.
### end excerpt ###
cat /usr/lib/systemd/system/NetworkManager.service
[Unit]
Description=Network Manager
After=syslog.target
Wants=network.target
Before=network.target

[Service]
Type=dbus
BusName=org.freedesktop.NetworkManager
ExecStart=/usr/sbin/NetworkManager --no-daemon
# Suppress stderr to eliminate duplicated messages in syslog. NM calls openlog()
# with LOG_PERROR when run in foreground. But systemd redirects stderr to
# syslog by default, which results in logging each message twice.
StandardError=null

[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.NetworkManager.service
### end cat ###

The file: dbus-org.freedesktop.NetworkManager.service does not seem to be existent

This error causes network-manager-applet to mallfunction with the following message: "The system network services are not compatible with this version"

Workaround:
ln -s /usr/lib/systemd/system/NetworManager.service /usr/lib/systemd/system/dbus-org.freedesktop.NetworkManager.service

After the link there is no more flooding of the log and gnome-networkmanager-applet is working again.

Additional info:
extra/network-manager-applet 0.9.6.4-1 [installed]
GNOME frontends to NetWorkmanager
extra/networkmanager 0.9.6.4-1 [installed]
Network Management daemon