Slackware :: GLib-GObject-WARNING **: Cannot Register Existing Type `_PolkitError'

This is my slackware 13.1 new installation `.xsession-errors'.

Code:

<stdin>:1:3: error: invalid preprocessing directive #Those
<stdin>:2:3: error: invalid preprocessing directive #or
<stdin>:3:3: error: invalid preprocessing directive #Xft

[code].....

(polkit-gnome-authentication-agent-1:1742): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'
(polkit-gnome-authentication-agent-1:1742): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed