Unable to connect to Xfce Power Manager: xfce4-power-manager-settings-CRITICAL

(xfce4-power-manager-settings:2586): xfce4-power-manager-settings-CRITICAL **: Unable to get configure information from xfce power manager: Did not receive a reply: Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

# Xubuntu 14.04 or newer
Settings --> Session and Startup --> Session: Clear saved session

rm -rf ~/.cache/sessions


Update