(nm-applet:6416): nm-applet-WARNING **: Could not find ShellVersion property on org.gnome.Shell after 5 tries

(nm-applet:6416): nm-applet-WARNING **: Failed to register as an agent: (4) 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.